Blood pressure refers to the pressure of the circulating blood as blood moves through arteries, arterioles, capillaries, and veins.
Blood pressure refers to the force exerted by circulating blood on the walls of blood vessels, and constitutes one of the principal vital signs. Blood pressure is always given as two numbers – systolic pressure (when the heart beats) and diastolic pressure (when the heart relaxes).
Signs of high blood pressure include, headache dizziness, pounding in ears, and a bloody nose. For most people who suffer with hypertension, there is no obvious cause why their blood pressure is high. Healthcare professionals use a stethoscope and a manual sphygmomanometer to measure your blood pressure. Medical research shows that as we age blood pressure rises slightly to accommodate an increased demand of oxygen and nutrients. Some heart attacks are sudden and intense, however most heart attacks start slowly with mild pain and discomfort. Symptoms of a stroke include sudden numbness or weakness of the face, arm or leg, especially on one side of the body, confusion, trouble speaking, or seeing, sudden severe headache.
If you answered yes to one or more of the above, you should talk to your doctor about how you can reduce your risk through lifestyle modifications.
Angina is a form of heart disease where the blood flow to the heart is restricted by a blockage in one or more of the arteries that carry blood into the heart. One of the factors that keep you alive at this moment is the blood circulating in your veins. We are indebted to this fluid that constantly circulates through our bodies, for our living healthy lives.
However, this system functions at every moment and in a flawless manner for each of the 100 trillions cells in the body.
Five liters (1.3 gallons) of blood must circulate in the veins running through all parts of a body of average weight. The propulsive force that allows the blood to flow to every cell in the body is provided by the heart, with its special pumping system. For this reason, the body’s oxygen needs to be constantly monitored and kept at a fixed level. On the other hand, the body’s organs need various substances in order to perform their own functions. As you have seen, a very delicate system inside us functions at every moment, according to a flawless plan. The blood reaches every corner of the body by means of the heart, with its dual pumping mechanism. Also exceedingly important is that the heart's indefatigable muscles pump a level of blood that depends on the prevailing circumstances.
The heart carries blood and all essential substances to the cells throughout the body, and when it can no longer function, death ensues.
No man-made pump can match the heart's ability to work tirelessly for an entire lifetime and to regulate the quantity pumped according to prevailing circumstances.
The heart begins beating when the human being is still an embryo in the womb, before any nerves have connected the heart to the brain. As you know, in the event of a cut in the energy supply, a generator is a device that can take over and continue producing energy that prevents machinery from halting or being damaged.
The only answer to all these questions, of course, is Almighty Allah, the Lord of the Worlds. Allah is He Who created the heavens and the Earth and everything between them in six days and then established Himself firmly upon the Throne. The cells that contract so tirelessly must possess a design that can begin to work the moment electrical current reaches them. Every long, thin cell has a cell membrane that divides the cell from the environment outside and fiber-like proteins that are able to contract. As a result of complex interactions of ion pumps and channels, a heart cell contracts thanks to the electrical and chemical differences occurring along the length of its cell membrane. The events described here are in fact only a very general account of the true state of affairs, which is much more complex in its details. Heart cells contain a high level of potassium, and the fluid outside the cells is rich in sodium.
When spread out thinly on a microscope slide, different heart cells will beat at different speeds. The heart possesses a natural battery that regulates the speed at which it beats—a specialized electrical cell node known as the SA node, (for sinus or sinoatrial node), located in the upper part of the right atrium. A node of tissue known as the SA node in the right atrium of the heart serves like a generator to provide electricity, sending some 72 electrical impulses a minute to the heart of a resting adult. For example, the group of cells known as the atrioventricular fascicle (His bundle) has a speed of 40 to 60 beats a minute. But the heart and blood vessels do more than speed up or slow the blood circulation in response to the body's needs.
The deceleration or acceleration of the heartbeat generally leads to tightening of the chest and discomfort expressed in the form of palpitations. In cases where the heart cannot make this adjustment, an electronic pacemaker is used to adjust the speed of the heartbeat.
QT syndrome is an inherited condition involving defects in the potassium channels in the heart, which impairs the heart's ability to transmit electricity. The heart's electrical activities need to be simultaneous if the organ is to properly perform all its functions.
In order for the heartbeat to occur, the potassium channels must open and the potassium ions have to be permitted to leave the cell. From that point of view, both the functioning of the heart and its design must be flawless. As well as slowing down the electric current and regulating the heartbeat and pumping blood to the body, the AV node has the vital function of acting like a reserve generator to replace the main one if anything goes wrong with it. No doubt the presence of such a system in the body shows that it is the work of a Creator possessed of intellect and consciousness. The waves of energy that cause the heart to work is initiated by the cell group known as the SA node, and pass, with the help of the artery muscle, to the AV node, and from there to the right and left fibers. Most people know that their hearts speed up under certain circumstances—as when they quickly climb a staircase, run or become excited.
Most heart attacks occur when one of the arteries that nourish the heart with blood becomes blocked.
Whenever you do something that requires effort, the muscles around the veins accelerate the flow of blood returning to the lungs. To keep the heart from beating so fast as to damage itself, a special security mechanism is needed. It is completely incompatible with logic to maintain that unconscious cells know that a too-rapid heartbeat will harm the body and take precautionary measures to prevent it—or that these cells came into being by chance. Receptors measure excessive blood pressure and are located in just the right place in the aortic wall. The spinal bulb analyzes the information that reaches it and grasps the importance of the situation. These and many other actions requiring intelligence and consciousness cannot possibly result from the chance cooperation among unconscious atoms. In individuals with advanced heart disease, the electrical signals that regulate the pumping between the chambers of the heart become irregular. The human body sometimes needs to be stronger, more resistant and to exhibit a higher performance than normally.
For situations like these, the necessary precautions have been taken, and another system has been installed in the human body. Muscle cells and especially muscle cells of the heart have large numbers of receptors designed to pass adrenaline, a stimulant hormone. As you have seen, it is astonishing how cells made up of unconscious atoms immediately identify this danger, declare a state of emergency, and take the relevant measures. First of all, there is a technology in the heart far superior to that of any man-made device. You can read Harun Yahya's book The Miracle Of Electricity In The Body online, share it on social networks such as Facebook and Twitter, download it to your computer, use it in your homework and theses, and publish, copy or reproduce it on your own web sites or blogs without paying any copyright fee, so long as you acknowledge this site as the reference.
Who establishes the cells that comprise you—and thus, this system that keeps you alive? And what have you done to ensure the existence of this circulatory system that gives you life? Although you had never encountered the air in the external world until the moment you were born and took your first breath, the respiratory system that enables you to breathe was formed while you were still in your mother's womb. It is God Who created these systems for you and placed them in your body in the most flawless manner. The heart that gives you life and the circulation system are a central, indispensable part of this flawless and impeccable order.
This fluid flowing through your body, your blood, is a special blessing and a great miracle.
You can read Harun Yahya's book The Miracle Of The Blood And Heart online, share it on social networks such as Facebook and Twitter, download it to your computer, use it in your homework and theses, and publish, copy or reproduce it on your own web sites or blogs without paying any copyright fee, so long as you acknowledge this site as the reference. When checked, Shutterstock's safe search screens restricted content and excludes it from your search results.
To pose this question another way, could you set out a network approximately 100,000 kilometers (some 60,000 miles) long, in the most appropriate manner, in such an economical way as to fit in the human body, and so the network could link to every one of our 100 trillion cells? These are just a few of the innumerable facts that prove there is no room for coincidences in the human body. In order to join the bloodstream, the first place that a red blood cell produced in the bone marrow will reach is the left atrium, where oxygenated blood is collected. The small red blood cell is now in the body's greater circulation, or systemic circulation. The aorta leaves the heart and divides in two: The upper branch goes to the head and arms, and the lower to various subsidiary vessels and organs.
In the middle layer of the aorta are elastic fibers composed of smooth muscles, of great importance in terms of regulating the amount of blood sent. Elastic fibers on the outer layer of the artery provide resistance against pressure, such as the powerful heartbeat.
That the arteries are hidden deep inside the body is a precaution of the greatest importance. The flow of blood to all tissues is controlled almost entirely by small arteries and arterioles.
The small red blood cell, having entered an arteriole, then branches off to the tissue it will subsequently feed. If you live in an average-size home, it will have a floor area of approximately 150 square meters (1,615 square feet). The artery that enters any organ divides and thins six to eight times before becoming an arteriole, the capillaries' control valve. A person can comprehend the magnificence of the system confronting him only when he stops to consider these features in detail.
These intelligent pipes, just a few microns in size and consisting of connective tissue and muscle tissue, control the flow of blood according to the need of the individual tissue cells. Having entered, our small red blood cell continues through this narrow zone with difficulty, and in stops and starts. The work these capillaries do is clearly precautionary; something that only an intelligent entity such as a human can perform. While the red blood cell loads with carbon dioxide and gets ready to return, the tunnel around it widens increasingly as it moves away from the capillaries. These giant tunnels through which the red blood cells proceed on their way are veins, the vessels by which the cells traveling through the body return home. Veins are able to carry three times more blood than do the arteries and capillaries, thanks to their special structure.
Here it will be useful to provide some important information: 84% of the entire blood of the body is in the systemic circulation, with 64% on its return journey in the veins. Unlike the arteries, the veins are not subjected to strong blood pressure, and therefore have different structures. The level of blood in the capillaries, on the other hand, is rather low compared to their work. When the body begins to lose blood, and when blood pressure begins to fall, pressure reflexes arise in various parts of the circulation, and these send nerve signals to the veins.
Being under low pressure, it might appear difficult for blood in the veins to move through the body, especially upward toward the heart. Despite this difference in pressure, the amount of blood flowing from the arteries and the veins is always the same. As a requirement of the work the veins perform in our bodies, they possess a different structure.
The concept of balances within the body may be unfamiliar to most people, because they spend their lives with no great difficulties.
If this balance is disrupted, blood sent out to the extremities cannot return, but will accumulate in various places in the body.
Considering the importance of the equal amount of blood coming and going, you can clearly see that this is a perfect balance specially created by God, in His name as The Giver of Life (Al-Muhee).
After its journey in the veins, blood returns to the heart to be transported to the lungs, where the transported carbon dioxide will be dropped off. Since the red blood cell began its journey and traveled through the entire body, 40 seconds have passed.
From the right ventricle, the blood reaches the pulmonary artery, which divides into the right and left pulmonary branches.
The air enters the lungs by way of the bronchi, which are divided many times until they end in the alveoli.
The barrier between the air in the alveoli and the blood in the capillaries is a total of 4 micrometers thick—equivalent to half the diameter of a red blood cell. Recall that if the capillaries were slightly further from the alveoli, then that vital exchange would be impossible. Weighing the advantages and disadvantages of something to be done, and taking the relevant precautionary measures, is an ability peculiar to reasoning human beings. The brain is in constant need of nourishment and oxygen, since everything that takes place in the body, and all the organs are under its control. The blood flow of every tissue in the body is controlled in such a way for meeting its requirements—neither more nor less. What if there were no such control system, so that every tissue and organ were nourished with the same quantity of blood?
When met with extremely cold weather, your body's blood vessels may even sacrifice a finger or a toe to save you from freezing to death, and completely halt the flow of blood to that area. The constriction and enlargement of the blood vessels is the result of an order given by the brain. The capillaries' ability to control the flow of blood directly is a very important property in terms of keeping the body temperature stable. In view of these many magnificent precautions, every rational person can see a magnificent order and complete perfection that surpasses human wisdom.
These perfections, which have been described since the start, show that the mighty presence of God is everywhere, and to help us be aware of that fact, His splendid works exist in our own bodies as well. All who use their intellect must consider the existence of the Hereafter and seriously fear the torments of Hell. And [when] the True Promise is very close, the eyes of those who disbelieved will be transfixed: "Alas for us! He cast firmly embedded mountains on the earth so it would not move under you, and rivers and pathways so that hopefully you would be guided and landmarks. 117 Body Atlas - The Human Pump, Video by Pioneer Production for The Learning Channel, Discovery Communications, Inc., 1994.
When the measurements are written down, both are written one above or before the other with the systolic being the first number.
These symptoms typically don’t occur until high blood pressure has reached an advanced and even a possibly life threatening stage. This condition is called essential hypertension and it is especially important that it is kept under control. Most heart attacks involve discomfort in the center of the chest that lasts more than a few minutes, or that goes away and comes back.
Your doctor will determine if preventative therapies such as ASPIRIN 81mg are right for you.
Usually, the first sign Angina is a pain in the chest, not unlike a squeezing or pressing sensation. In contrast to any other fluids in the body, blood has functions that require intelligence and consciousness. Blood’s most fundamental duty is providing the oxygen that cells need to live, by circulating from the deepest folds of the brain to the outermost layers of our skin.
If a fifth of this portion, a one-liter quantity, is absent, the remaining blood becomes more difficult to move. It is definitely illogical to maintain that blood cells acquired such ability by themselves, as the result of chance and possess the consciousness to perform a series of calculations and constantly fulfill this function flawlessly. These substances which are carried by the blood include nutrients such as glucose, amino acids, vitamins and minerals and, most important of all, oxygen. The two left chambers of the heart pumps fresh oxygen-rich blood to the entire body, while the right chambers send returning blood to the lungs for carbon dioxide to be extracted and replaced with oxygen. The one on the left pumps oxygenated blood to the body's organs and tissues, , and the one on the right pumps CO2-laden blood directly to the lung, causing all the blood in the body to circulate 1,000 times a day. Like all other organs in the body, it runs on electricity; but this energy that allows the heart to beat does not come from outside, but is produced with the contraction of the heart muscles. Diastole: During the first phase of the cycle, oxygenated blood enters the left atrium and deoxygenated blood simultaneously enters the right atrium. Atrial systole: Impulses from the sinoatrial node initiate the second phase of the cycle, during which both atria contract, squeezing any blood that remains in the atria into the ventricles.
Ventricular systole: The ventricles contract during the third phase of the heartbeat sequence.
The smaller and uppermost are known as the atria and the larger, lower ones as the ventricles.
When the large ventricles contract, these valves open and blood is allowed to flow to the body.
Instead, the heart is an engine that produces its own energy used during its pumping process. The heart is able to continue beating even during heart-transplant operations when all the nerves have been severed and the organ is removed from the patient's chest cavity.
The heart, one of the most vital organs in the human body, has also been granted a similar form of protection to prevent its coming to harm, since for the heartbeat to stop for even a moment could lead to serious bodily damage, and might even prove fatal.
The heart functions thanks to an ensemble of programmed and systematic electronic circuits, with a great many interconnections. A group of cells known as the SA node produce electrical impulses in the upper part of the right atrium. It takes 0.03 seconds for the electrical impulse to travel from the SA node to the AV node, and this is known as normal sinus rhythm. The cells must respond to every single signal that reaches them, on an average of 72 times per minute.
Proteins embedded in the membrane carry important signals or substances from one side of the membrane to the other. At this point, the sodium and calcium channels close and the ion pumps move the ions outside the cell, causing it to return to its original state. The heartbeat, which requires so many conditions to be met and work together flawlessly, is one of the countless examples introducing us to the knowledge of our Lord.
Each coronary cell acts literally like a living battery, producing electricity by means of two elements found in the blood in large quantities: sodium and potassium.
These cells must first combine in the right sequence, but it is still not enough for them merely to join together.
Furthermore, they must know the level of electrical current that will cause the heart to work as a whole, and to produce that current at exactly the right level—neither more nor less. These cells initiate electrical impulses that stimulate the heart muscles to contract regularly. The heart also contains nerve fibers transmitting electrical signals from the SA node to other parts of the heart.
Each firing passes through a specialized electrical path and stimulates the muscle walls of the heart's four chambers in a specific order. The large ventricle, now filled with large quantities of blood and whose turn has now come, contracts and pumps blood in to the body. The energy given off by the generator should first stimulate the small atria and then the large ventricles. The abnormal acceleration or deceleration of the heartbeat may result from disruptions in the heart’s electrical signals. However, these artificial devices bring with them a number of drawbacks that require careful attention. The body's natural pacemaker, which regulates the rhythm of the heartbeat, sends an electrical signal to every cardiac cell for their contractions to begin.

In QT syndrome, however, as a result of functional defects in these channels, the cells' acquisition of electrical properties for the next beat is delayed. Defects of the electrical current in the cells alter the starting time and speed of the signal. Reserve systems in the heart permit this important rhythm to be discharged without interruption. If the SA node is damaged, the AV node takes over the task of regulating the heartbeat’s rhythm.
That consciousness and intellect are those of our Almighty Lord Who created the heavens and Earth. In situations that place a strain on the heart, when a person is under stress or running a fever, the SA node speeds up since the tissues need the heart to pump more blood.
When the parasympathetic system is needed, it can slow the heartbeat to 40 beats a minute by easing the force with which the heart muscles contract.50 When they detect that the blood pressure has risen, receptors in the arteries stimulate the brain by means of the parasympathetic nerves to release the chemical known as acetylcholine. When the muscle cells are deprived of oxygen or nutrients, they become acidic and begin beating spontaneously in an uncontrolled manner.
The aortic veins emerging from the left side of the heart contain receptors that measure blood pressure.
This flawlessly functioning system was created with the knowledge and artistry of our Lord, Who enfolds and surrounds all places. For example, when a person has to defend himself or escape, the heart needs to beat faster and to pump more blood.
In order for those signals to be produced, the sodium, potassium and calcium ions need to be present at particular levels in the blood. But most important of all, is that there would be no purpose for the heart to come into being by chance on its own.
Sometimes when people have heart problems, they need a miniature battery to regulate their heartbeat. Marshall Cavendish, The Illustrated Encyclopedia of The Human Body, Michael Cavendish Books Ltd., Londra, s. At the beginning of its development, each human being consists of a tiny collection of cells just starting to divide and develop.
One day, a small node of cells in the center of that assemblage receives a command and suddenly starts pulsating.
In other words, it maintains life in the 100 trillion cells in your body which are just as alive as you. There was absolutely nothing you could do to have formed such a system, because before you even opened your eyes, you began living according to a regimen prepared for you in advance. You were born with a ready-made digestive system that would eventually digest foods of all kinds. Almighty God created the same perfect systems in all human beings who have ever lived, and in all those billions of humans who are living today. The miraculous fluid known as blood, pumped by your heart muscle, has been carrying life-giving substances to every cell in your body from the moment it started to flow. Let us examine how it operates so that we may once again witness the existence and might of our Lord, the Creator.
That God has created a flawless design does not mean that He first made a plan and then followed it. Another miraculous aspect of this is that generally, humans are totally unaware of this splendid network, thousands of kilometers long, extending to 100 trillion cells. Everywhere in your body, from eyelids to toes, from your hair roots to your eyelashes, is linked by this perfect structure. The purpose behind the red blood cell being here is to load up with oxygen and transport it to the other cells of the body. By means of this great circulation, our small cell has now entered a tunnel system that travels the entire body, with the exception of the lungs. When the body is at rest, the oxygen is transported to the tissues in less than 10 seconds after it is picked up from the lungs. First, there is an outer casing consisting of fibrous connective tissue, whose presence is of the greatest importance. By contracting or expanding, the muscles serve to narrow or widen the diameter of the artery.
The section that heads upward leads to the head and arms, and the artery that branches off downward reaches the other organs by means of various sub-arteries.
The middle layer consists of elastic tissue and smooth muscles, which are important with regard to the regulation of the amount of blood dispatched. Thanks to their elastic muscular structure, which is capable of expanding, the arteries have a storage function that allows there always to be blood in the body. It then travels through the whole body, from the toes to the brain, by way of blood vessels and capillaries measured in mere millimeters.
For that reason, the main arteries 2.5 centimeters (1 inch) in diameter subdivide until they assume the form of capillaries just a few microns in diameter. Subsequently, the arteriole itself will branch two or three times, reducing its diameter to just 9 microns, and will continue on as a capillary. Every region of the body has been penetrated by an extraordinarily wide ranging network of capillaries.
Flow of fluid across the capillary walls generally depend on the difference between blood pressure and osmotic pressure at different points of the capillary bed. Otherwise, the account will be no different from what can be found in any physiology textbook. Thanks to the hemoglobin molecule inside it, it is ready to deposit the oxygen it has carried en route.
However, the truly noteworthy events taking place in the body are unknown to the great majority of people. With the carbon dioxide it has taken from the cell, its charge is now different and it now sets out through the veins toward the heart. It is sufficient to see them in order to comprehend the source of intelligence manifested in them. A great many erythrocytes and other cells have joined it, and they move through the increasingly widening tunnel like a great army. One is the superior vena cava, which comes from the head, arms and upper body, and the other, the inferior vena cava, which comes from the lower body. Thanks to their muscular walls, the veins can store large quantities of blood by enlarging and constricting. Receiving this information, the veins begin to constrict and, thanks to this ability, are easily able to overcome the body's blood loss. The most important of these are small valves, unique to the veins, and not found in the arteries.
The body needs such equilibrium, or else blood will accumulate in certain sites in the body.
This example once again shows us the superior knowledge and creation of our Lord, Who created us so perfectly. Yet there are innumerable balances in the body that need to be maintained and should never be impaired in any way. As we examine everything in detail, we become better acquainted with God, our Creator, and can comprehend His might. With the opening of the valve on the right atrium, the cell and its companions move into the right ventricle.
In the lungs there are some 300 million alveoli, all of their membranes covered with capillaries for the exchange of oxygen and carbon dioxide. Each minute, the lungs send 56 x 1021 (the number 56 followed by 21 zeros) oxygen atoms to cells all through the body.119 All you have to do is to breathe. The extreme fineness of this barrier shows how very swift and effective the two-way exchange of gasses across this barrier is. The fact that they are located right beside the alveoli is yet another example of the perfect and amazing design we have encountered throughout this book. However, looking at the human circulatory system, we can see that some of the excellent organizations in the body are more intelligent than human beings.
When you sleep, the heart pumps only the blood needed to keep you alive—of course a valuable saving. Under normal conditions, the body makes no special effort to nourish the muscles, which comprise 30-40% of the body's weight. If our muscles needed that much blood even under normal conditions, the heart would be unable to match that extreme tempo. Interestingly, the heart, blood vessels and blood cells seem to be aware of this vital fact. For example, the flow of blood to a tissue needing a lot of oxygen is as much as it needs, or maybe a little more, but never greater than that. The heart would have to pump more blood than it does now,122 and such a tempo would soon exhaust it. In cases of emergency, they know to take the appropriate and intelligent life-saving precautions.
At the same time, the brain sends a message causing the muscles to shiver, causing the body temperature to rise.123 When you go out in snowy weather, you will immediately feel these effects of your body taking these precautions.
By means of various nerves and hormones, it sends messages to the relevant blood vessels and it is accordingly determined which tissue needs what. When it is a hot day, the blood vessels in the body use the exact opposite method: Blood vessels close to the skin dilate. Anyone who seeks an explanation for all this will realize the absolute existence and dominion of God.
The Elite Honors program is streamlining the way organizations do business with Synergy WordWide while maximizing each Team Member’s earning potential. Heading the list of these functions is distributing the energy that trillions of cells require to live. If it is unable to fill the veins, then the very fine blood vessels will adhere to one another. That so, you can once again see the importance the veins stretching all through the body, of blood reaching everywhere in it and flawlessly performing all its duties. Therefore, there is a regulation in the level of blood transfer that, however, does not function like a pre-programmed machine. Each one of your trillions of cells produces many waste products, such as carbon dioxide and urea that collect in the blood and could have harmful effects on the body.
It is impossible for organs like the heart and liver, consisting of unconscious cells, to accomplish this by themselves. Antibodies and leucocytes in the blood immediately identify the place where the danger has arisen and immediately reach their target destination with the rapidly flow of blood. Yet they can determine direction, identify sickly cells, become aware of danger, and eliminate those dangers by acting in concert—all exceedingly conscious actions. The left-hand chambers possess thicker muscles, since they pump at a higher pressure in order to send blood to reach the whole body. An adult heart pumps 250 million liters (66,040,000 gallons) of blood over a 70-year life span. Under such circumstances, the heart increases its working tempo from 70 to 180 times a minute, and the level of blood reaching the tissues can increase five-fold.
Since the heart consists almost entirely of muscle and beats around 70 times a minute, then an electrical impulse needs to be produced that many times.
Allah created many matchless structures, such as the heart, in the billions of human beings. The three successive phases of the heart's rhythmic beating are made possible by very sensitive timing and adjustment. The valves at the exits of both ventricles open and the blood is forced into the aorta and pulmonary artery. For example, when clean blood reaches the left side of the heart it first fills the small, upper atrium.
The moment the contraction stops, however, the valves close, preventing  the blood from returning to the heart.
Even if we cannot actually see the Designer Himself, we can see the evidence for His existence by viewing the design.
Under a microscope, a heart cell even continues to beat by itself as long as fresh oxygenated blood can reach it.39That is because there is a generator in the heart cells that produce their own energy. Therefore, the electrical system that keeps the heart working must itself work without interruption. This electronic control-and-management system co-operates with a large number of other organs, from the kidneys to the brain, from the arteries to the hormonal glands.
These impulses spread throughout the heart and allow the four chambers to contract at just the right time. In terms of electrical charge, this polarizes the cell, generating a voltage difference between the inside and the outside of the cell.
At a state of rest, the membrane potential in any cell is more negatively charged than its external environment. The atoms constituting these elements often lose a negatively charged electron, and thus gain a positive charge. Since the membrane pumps sodium out faster than potassium is taken in, a positive charge forms outside the cell. Heart cells in the human chest do not beat at different rates; although each one initiates its own beat, they all beat in a rhythmic harmony. The SA node produces the electrical stimuli that spread throughout the heart, ensuring that its four chambers all contract at the proper times. In the event that the SA node is damaged, other sections of the heart's electrical system are able to take over that function, despite beating at a lower speed. The way that such a vital system has been created together with a backup system is just another instance of Allah's protection of man. An electrical impulse leaves the SA node and travels directly to the right and left atria, causing them to contract together, all in 0.04 of a second. First the upper two chambers of the atria are stimulated, after which there follows a slight delay for the two atria to empty.
Yet since the electrical wave moves very quickly, both pumps should contract at almost the same time, and the heart's work would be seriously impaired. Extra blood rushes to the stomach when we eat, to our lungs and muscles when we run, and to the brain when we think and speak. In order to understand rapid or slow palpitations, we need to examine how the normal heartbeat comes about and acts throughout the heart. They must not enter magnetic fields, and have to be kept away from devices that generate magnetic fields.
When the heart is stimulated excessively by emotion or exercise, the defective channels don't allow enough potassium to depart, and this electrical irregularity can lead to the sudden death. A signal that begins too early will cause the heart to beat prematurely or else cause an insufficient contraction. But this spare generator cannot produce signals as strong as those from the original power source—only 40 to 50 signals a minute.
In this way, the sympathetic nerves raise the blood pressure by narrowing the blood vessels, and the adrenaline glands over the kidneys release the hormones adrenaline and noradrenalin, which increase the speed of the heartbeat. I wonder just which carbon atom is experiencing this emotional trauma?), our reptilian response of fight stimulates the release of large doses of adrenaline in to the blood.
Our Almighty Lord created all of these cells and inspires in them the knowledge of what to do, and when. Bearing in mind that these levels are regulated by organs such as the kidneys, intestines, stomach and lungs, it's even more evident that such a system cannot be the result of a fictitious mechanism such as evolution.
These devices, known as pacemakers, permit the heart to beat at a regular speed, by sending it small electric shocks. Blood reaches every point in the body, from the eyes to the fingers, through a perfect circulatory network that interpenetrates the entire body. Adnan Oktar that are present in our website and in all other Harun Yahya works belong to Global Publication Ltd.
But assuming that you have been successful, still you will need a very large area for the network of pipes. A circulatory system such as you could never produce has already been formed inside your body.
You see no trace of it when you glance in the mirror, never feel its ceaseless activity, seldom become aware of the noises your heart produces as it beats. Leaving the left atrium in order to join the circulatory system, the red blood cell first encounters a giant door. The first tunnel the red blood cell enters is the aorta, the most powerful artery in the body. The quantity of blood going to the organ and tissues is balanced thanks to this elastic structure. Under resting conditions, these arteries generally distribute oxygen to the tissues within about 10 seconds of receiving it from the lungs. The flat epithelial tissue in the inner layer has a smooth, literally polished surface that permits the easy flow of blood by reducing friction. This elasticity in the arteries is also important, since their flexibility prevents the pressure from rising too high when blood is pumped through the system.
In these regions, the passage of blood as it strikes the arterial wall under high pressure can be felt under the skin with every heartbeat. During injury, therefore, the blood flowing in a heavy, dense form has the prospect of clotting easily.
It deposits oxygen at the tissues and takes up carbon dioxide, enabling it to be given off by the lungs when it completes its journey. They therefore possess very special features: Thanks to their strong muscular walls, they control the blood flowing into the capillaries and prevent them from being damaged. Arterioles possess a most important powerful muscular system capable of completely closing themselves or else widening severalfold, mainly to alter the blood flow reaching the capillaries, and to be able to send the tissues as much oxygen and nutrients as they need. They may cause the flow to stop completely, besides regulating its speed, because they are able to determine to which cells they will give special treatment. Some of these capillaries are so small that they cannot let even some large blood cells pass through them.
The capillaries in just one single person could stretch from one end of the USA to the other.109 This incomparable mechanism is brought into being to nourish all the cells in the body.
How this marvel of engineering, in thicknesses of just a few microns, can reach every cell in the body is an extraordinary creation. These vessels ensure the exchange of fluid, nutrients, hormones and other substances between blood and the tissues. This is most important, because this facilitated passage permits oxygen and carbon dioxide to be transmitted rapidly and in large quantities.
Through this important precaution blood does not flow through the capillaries constantly, but is sporadic. It approaches every cell in need of oxygen, and deposits the oxygen molecules in a very careful way so that they will harm neither itself nor the cell. Most reading these lines will be learning for the first time about these bodily phenomena, such as those in the capillaries, and will be newly aware of the precautionary measures taken. Carbon dioxide in these veins returning to the heart will be expelled by means of the lungs, and the blood cells' endless journey will start again from the beginning, with oxygen molecules. The main reason is that the blood no longer flows under such high pressure on its return journey. The capillaries extending for 60,000 kilometers (37,280 miles) in the body contain only 5% of the blood.
Even if 20% of the blood is lost, thanks to the special reservoir system of the veins, no problem occurs: The circulatory system continues to function as before. Every moment you move, the muscles in your body create pressure on the veins and help the blood to move.
These valves permit blood in the veins to flow in one direction only, similarly to the valves in the heart, and close again behind it, preventing the blood, moving under low pressure, from running back down again.116 There is no need for such a mechanism in the arteries, where pressure is very high and there is no possibility of the blood moving backwards. Because of lower pressure in the veins, the blood doesn't flow fast as in the arteries. Thanks to them, blood is prevented from flowing backwards and always forwarded to the heart. Since insufficient blood returns to the heart, the amount of oxygenated blood will be very low, and clean, oxygenated blood sent by the heart will be insufficient for nourishing the body.
Glucose is absorbed by the intestines and stored in the liver temporarily in the form of glycogen.
The newly oxygenated blood is carried by the pulmonary vein to the left atrium of the heart, where its journey began. With the amount of the air we inhale throughout the day, this magnificent exchange of gasses in our lungs takes place at enormous speed.
Not even a human using his reason, able to plan and engineer, possesses the ability to make such a flawless design, which reveals its presence clearly at all points inside the body. Blood is directed to your stomach when you eat, in your lungs and your muscles when you swim, and in your brain when you concentrate on reading—because the cells mostly in need of nutrients and oxygen are in those areas.
Yet our Lord, Who has created all things with a measure, has created our hearts and muscles to be compatible with one another. This impeccable control keeps the heart's activity to a minimum, while never allowing the tissues to be nourished insufficiently. When climbing a mountain or engaging in strenuous sporting activity, for instance, your body needs a higher level of oxygen.

For example, a cold environment that causes body temperature to fall can be dangerous; the brain may suffer.
If the amount of blood reaching the brain declines, both the brain's own blood vessels and other blood vessels take precautionary measures.
For example, when you feel very hot or when you are embarrassed, signals from your nerves reach the muscle cells within the walls of the arterioles.
For ignoring the countless proofs God has shown them, and even for seeking other explanations for what they are shown, the response may be a very great one.
When the bulb is pumped it inflates the bladder inside the cuff, which is wrapped around your arm.
Piette’s guide for blood pressure of 100 plus your age for men, subtracting 10 for women, and this is after this rule had been in use for five or more decades. The area of the brain that is being fed by these broken vessels start to die, and this will cause a stroke.
The defense system that protects the body from germs, the system that collects wastes and expels them from the body, repair and maintenance of the tissues, the establishment of communications and regulation of body temperature are all made possible by the blood.
If blood fails to reach a cell, it suffers oxygen deficiency that leads to the death of that cell. No artificial pump can work for a lifetime without rest and adjust the rate of pumping according to circumstances. Blood carries nutrients to cells with wholly different responsibilities, and transports their collected waste products to the kidneys, lungs and liver. These substances carried by the blood are of vital importance to the survival of all the body’s organs. In extraordinary circumstances, blood circulation alters its way of working according to the situation. But urea is removed from the body by being carried to the kidneys, while the carbon dioxide is carried to the lungs, from whence it is expelled. It is equally also impossible for unconscious blood cells to assume such a vital function as constantly carrying oxygen to all the other cells in the body.
Cells carry out a series of conscious, rational actions, such as recognizing the danger, identifying its location, traveling to the region by means of the circulation and immediately initiating a defense. It is unreasonable and illogical to assume that all these functions developed spontaneously, as the result of chance. Its tirelessly contracting muscle cells possess a special creation to work the moment an electrical current reaches them.
The valve is a gate-like device that opens or closes in order to control the flow of those liquids or gasses.
We can compare this situation to the way that valves prevent air from escaping after it has been pumped into a bicycle tire.
Similarly, the systems in our bodies also reveal the proofs of the existence of our Lord, Who created them all. The heart transports blood and all the vital materials to the organs and cells thanks to electrical energy.
Conductor cells transmit these electrical signals to the muscle cells that are responsible for pumping blood at approximately 70 times a minute. This electrical impulse travels so quickly from one side of the heart to the other that it appears that all the heart's cells are beating at once. This difference, known as membrane potential, enables certain proteins in the cell membrane, known as ion channels, to function like gates. However, the electrical stimulus arriving from the neighboring cell rapidly alters everything.
When the charge reaches a particular level, the flow is suddenly reversed and sodium ions re-enter the cell. The pacemaker in your heart contains an internal clock that regulates the speed at which your heart beats. This electrical impulse travels from one side of the heart to the other so rapidly that it gives the impression all the cells are beating at once.
There is then a delay that allows the atrium to contract and the ventricles to fill with blood. In the same way, electrical signals that are slowed down or accelerated will result in a delayed heartbeat, or one that does not take place at all, leading to various heart disorders. The speed of the heartbeat is regulated by a natural computer system installed inside the body.
The speed of the heartbeat is regulated by a natural computer system installed inside the body.47 For that reason, it is of the highest importance that the heart should beat constantly at a regular rhythm.
The hormone thyroxin released by the thyroid gland affects the workings of the heart by speeding the metabolism.49 The heartbeat can rise to five times its resting level.
If the blood vessels carrying clean arterial blood were not wide enough, they might tear and rupture. The central nervous system transmits the nerve signals that form as a result of this tension to the medulla oblongata. When this exceeds a particular level, the receptors become aware of the rising pressure and send messages to the spinal cord bulb, which again evaluates the situation and sends a new command to the heart.
Taken up by the heart muscles, the beat increases dramatically, pumping oxygen-rich blood to power hungry muscles in arms and legs.
The way that all these and thousands of other elements come together in the most harmonious manner possible is one of the many proofs of a flawless Creation.
The way that the unconscious cells in the heart combine to discharge such a vital responsibility happens through the mercy of our Lord. For example, a perfect pair of eyes was created for you to be able to see your surroundings clearly.
Would you be able to install such pipelines in miniature form in an area the size of the human body? So perfectly created is this system that barring the emergence of some defect, you spend your life quite problem-free, unaware that minor defects are repaired without your knowledge.
If the arteries lacked this property, then the blood arriving from the heart under high pressure would inevitably damage, even tear them. When a person engages in strenuous exercise, however, the speed of the blood in the arteries increases.
In the event that an artery is damaged, however, the bright, high-pressure blood is expelled very quickly.
Because of the high blood pressure in the arteries, the erythrocyte can travel a long distance inside the body in a matter of seconds, its objective being to reach the capillaries and deposit the oxygen it is carrying. They prevent these very delicate vessels from being damaged by the sudden entry of high-pressure blood. In order to be able to carry out this delicate determination, the blood leaves the small arteries and enters the arterioles, just a few millimeters long and 8 to 50 microns in diameter. This broad network, installed so as to reach every point in the body, is a most splendid one that should remind people again and again of the greatness of God. Even red blood cells pass through such capillaries in single file, or else by distorting their shape. Your hands, face, feet, arms and every square millimeter of your body all possess a perfect network of countless capillaries.
In line with that responsibility, the walls of the capillaries are exceedingly thin, and possess special structures that permit small molecules to pass through them. Therefore, these gasses are transported at a speed several times greater than substances such as sodium and glucose, which are not liquid-soluble.
If the tissue requires a large quantity of blood, then the capillary expands under the effect of a superior control mechanism and extends the period during which blood flows.
Even though the veins have no need to be able to withstand pressure, there is a most important reason for their being muscular. The heart contains 7% of the blood, and the pulmonary vessels 9%.115 The most striking aspect of this is the high level of blood in the veins, and the low level in the capillaries. The pressure applied by your leg muscles to push blood upward is equal to the downward pull of gravity. This system has been created by God in a flawless and detailed manner, and each type of blood vessel possesses the ideal system to transmit blood.
In other words, it seems impossible for the veins to carry as much blood as the arteries; yet that is not actually the case. Many factors might have a negative effect on this equilibrium, but the system for keeping this balance is so incomparable that the amount of blood leaving the heart and the blood returning to it are always the same.
For all the blessings created by God, a person must praise Him constantly and live for His approval. Therefore, the red blood cell takes its place in the right atrium in order to begin this new journey, known as the pulmonary circulation. It stays in the right ventricle for a short instant, until the second valve opens the way to the lungs. The surface area of the alveoli is 70 square meters (750 square feet), which is about the size of a racquetball court.
Following this exchange, our small red blood cell, now loaded with oxygen, has returned to the beginning of its journey in the left atrium to carry oxygen to the tissues. Therefore they need to continue their journey without any breaks, never making a mistake, and most important of all, by foreseeing all situations and conditions.
According to this, the heart pumps a specific volume of blood, the red blood cells distribute the oxygen they carry to tissue cells and, most importantly, the blood vessels direct its flow to its destinations. Before you meet any difficulty, the message is transmitted that your body is moving and the muscles need more blood. When you begin to work your muscles, however, your metabolic activity increases 50 times, and the blood flow to your muscles increases 20 to 25 times.120 This is really an astonishing change, but during exercise, muscles need this extreme flow of blood. You begin breathing very rapidly, and your heart beats very fast, to meet your body's rising need for oxygen. Thanks to this superior ability of the blood vessels, however, a human being can withstand the cold. The brain blood vessels enlarge or constrict, and other blood vessels elsewhere in the body slow the flow of blood through them in order to divert more to this important organ.
Additionally, if a blot clot blocks a narrowed artery, blood ceases to flow and a stroke will occur.
The propulsive force that propels this vital fluid to reach every cell in the body is provided by the heart. This reveals the wisdom of our Lord and the extraordinary nature of the heart's creation. In the event of poisoning, for example, the amount of blood flowing to the poisoned tissues is increased, to increase oxygen and remove as much of the toxins as possible.
No doubt that these cells, exhibiting a high level of consciousness that does not belong to them, are working for our survival under the inspiration of Allah.
Blood cells too small to be seen with the naked eye, devoid of any capacity for thought or reason, fulfill all these roles, which you cannot do for yourself, with the greatest care and scrupulousness. The heart, which is made up of these special cells, is an engine that creates its own energy. The heart performs its pumping cycle in as little as a quarter of a second, though this speed doubles during exercise. That is the reason why doctors employ electric defibrillators in the event of the heartbeat stopping completely. This harmony, which is one of the reasons for our survival, is another example of the mercy of our Lord.
This sudden change triggers an electrical charge, and the heart cell contracts and withdraws. This pacemaker is actually a collection of cells, but it functions far more perfectly that any electronic device. The electrical impulse heads directly for the AV node, and then to the atrioventricular fascicle after which it divides to the right and left and spreads rapidly towards the right and left ventricles, using the Purkinje fibers, and enables them to contract at the same moment. The AV node's delay gives the atrium time for to contract tightly and send the blood on to the ventricles. So perfect is the design of the electrical circuit in our hearts that the electrical energy first stimulates the small atria, is kept waiting for a time, and only then stimulates the large ventricles. How, then, did a group of cells in our bodies determine—and then meet—needs of which we are consciously unaware? Like a car traveling at a fixed speed, the heart's tempo also needs to be speeded or slowed in certain situations.
The skull might then fill with blood as in a stroke, and the individual be crippled by lack of blood reaching the brain. In the human body, there is such perfect regulation and such a network of data-exchange that no artificial processing network can begin to compare with it. The medulla analyzes these data and immediately sends a command to the heart, whose accelerator is activated and its rhythm speeded up. The adrenal cells producing this hormone know which language those heart cells will understand. Cells along the small intestine are constructed to absorb glucose, amino acids and fatty acids, the products of food digestion and transport these products to the adjacent bloodstream, where they'll be carried to the membranes of cells. This is one of the most important proofs that you have another perfect marvel of creation in your body.
If were laid out, end to end, they would stretch for 2,400 kilometers (1,491 miles).101 The length of the capillaries in the brain is around 650 kilometers (403 miles). Nobody in the world, no community, and no technology possesses the ability to produce a living network so flawless, flexible, and impressive. This smooth, slippery surface reduces friction and allows the blood to flow easily and quickly. This is most dangerous since the bleeding can swiftly result in death unless immediate precautions are taken.
As a result, fluid is expelled from the capillary by means of clefts at the arterial end, and is taken in the blood again in the venous end.
Even more astonishingly, all these networks are interconnected, each one being fed from a single source. In short, such vital functions as nourishing the tissues and providing them with oxygen, while collecting their wastes, all take place thanks to these capillaries. This means that only appropriate substances can cross into the tissues, and that other molecules must stay in the blood and continue on their way. This is in direct proportion to the tissues' needs for these gasses, which can pass the gates only when the need arises. Now ready for its return journey, it has picked up another load and must return to its destination—the heart, the first center where it picked up its load.
Thanks to their muscular walls, the veins can store large amounts of blood by enlarging and constricting. The veins carry three times as much blood in systemic circulation as the arteries and capillaries. When the veins leave the skeletal muscles after passing through very mobile regions like the legs or arms, the respiratory muscles assist them. The unbelievers seek for alternative explanations for the signs of creation in living things, and with those explanations, think that they can make others deny the existence of God and His creation.
This flawless division of labor once again reveals the flawlessness in God's creations. This extraordinary journey, which has been explained in general terms, has lasted less than a minute. When you begin running, your heart's pumping speed and volume increase by 6 to 7 times.
If they were to require such a large quantity under normal conditions, then it would be impossible for the heart to keep up. During bleeding, any decreased blood level in the body is communicated to the brain by the nerves.
All your tissues being nourished with the same amount of blood would lead you to experience a similar situation 24 hours a day.
Upon encountering cold air, blood vessels in the fingers and toes immediately constrict as the first precautionary measure.
The stethoscope is used to listen for sound of the heartbeat, and no sound indicates that there is no flow.
It keeps the body temperature constant and protects the body when any foreign substance enters.
Clearly, any phenomenon that did arise by chance would inflict damage on the existing order, rather than improving this magnificent system, because even the slightest error in the body’s microbiological system would have exceedingly undesirable consequences. This causes a small valve inside to close and another outside to open, and the piston is pumped, expelling the water. In this way, sodium ions (Na+) rapidly enter the cell, triggering the opening of the calcium channels.
Using conductive fibers, it distributes the electrical current it produces to every point in the heart muscle. This way, the ventricles fill with blood to their maximum capacity before receiving the electrical current, that signals them to pump out their contents. After the electrical signal has set out, the atria keep it waiting at a specific point until they have fulfilled their functions. This system functions without your knowledge, even at this very moment, showing that it is the product of a superior Intellect and Knowledge.
At the same time, they are aware that the body must be more resilient and therefore, the heart needs to beat faster.
The human circulatory system possesses such a miraculous organization that it is by itself reason enough to have faith in God.
This work of art belongs to God, the Creator of all things, the Generous, the Lord of all the worlds. Bearing in mind that these heartbeats take place hundreds of times a day, then logically, the probability of the artery tearing or rupturing should be very high. They therefore, with the inspiration they receive from God, possess the ability to meet the changing needs of the body. Add in the fact that just one of your fingers possesses hundreds of capillaries, and you can better understand the scale of this marvel. The blood in the inferior vena cava, immediately beneath the lungs, moves with every breath we take. He created human beings and made the innumerable complex mechanisms in the human body as proof of this creation. In other words, blood flows rapidly in the arteries, and in large quantities in the wider veins. The intelligent controllers of the body prefer to divert existing blood in more essential and important areas, such as the brain. The blood vessels in the brain enlarge or constrict in order to adjust themselves to this emergency situation. Since vessels in the hands and feet are near the surface, they can cause the blood to cool. If all the capillaries were open at the same time, there wouldn't be sufficient blood for the brain, and you would soon faint. As the pressure is released from the bladder, you will hear the sound of the blood flowing again. In addition, it carries out all these processes without interruption for an average of 70 years.
Between atria and ventricles are one-directional valves that open to let the blood flow pass.
In the same way, valves in the heart guarantee that blood can be pumped in only one direction. Were it not for this momentary delay, the ventricles would contract before they were entirely filled with blood, and not enough blood would be transmitted to the body. The heart cells obey this command and begin beating faster, and in this way, the body is provided with more of the oxygen it needs in emergency situations. Thanks to a powerful pump in this large section, it passes through another door and enters a narrow tunnel, or artery. Yet the protective system in question has eliminated that danger, ensuring that the artery can resist that pressure for a whole lifetime.
Therefore, the pressure set up by the chest cavity helps the blood continue on its way to the heart. Blood vessels in less important organs, aware of the situation, halt their own flows in order to protect the brain function. Their constriction prevents blood from cooling too much and the cooled blood from cooling down the heart and brain.
When both heartbeat and transmission system are working properly, they carry out an ordered and determined distribution of electricity. Most important of all, it undertakes the responsibility for carrying oxygen molecules to every cell in your body, thus keeping you alive. This is also a reflection of the affection in which God, Who protects and observes, holds His servants. The diastolic reading is when you hear no sound again, which means that the blood flow is back to normal.
When the ventricles contract, the valves close between them and the atria, and blood is prevented from flowing back in the direction from which it came.

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