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Author: admin, 14.12.2015. Category: Cause Of Ringing In Ears

A­When the heart beats, an electrical signal passes from the top of the heart, near the atria, down through the ventricles, and the chambers contract in that order.
On the left side, where oxygenated blood is coursing through, this gateway to the left ventricle is called the mitral valve.
Once both ventricles simultaneously fill with blood, the atrioventricular valves slam shut, preventing blood from moving back into the atria.
By this time, the heart's electrical signal has passed from the atria into the ventricles, so while the atria relax, the ventricles contract. It is the sound of these cusps coming back together to form a temporary seal that makes the sound we recognize as a heartbeat. Common carotid arteries - one branches from the aorta, another branches from the subclavian artery.
Pulmonary artery - the left and right pulmonary arteries carry blood from the right heart ventricle to the lungs.
Superior vena cava - up the left side of the body to return blood to the right atrium of the heart.
While the diagram on this page suggests that all blood must move through small capillaries to get from arteries to veins, this is not actually true. The red bone marrow of essentially all bones produces RBCs from birth to about five years of age. Thromboplastin reacts with calcium and prothrombin (produced by the liver) in the blood plasma to produce thrombin.
Blood pressure consists of two measurements: the systolic pressure and the diastolic pressure.
Systolic pressure, the first and highest number, is the force the heart places on the walls of the blood vessels as it pumps with each heartbeat.

Diastolic pressure, the second and lowest number, is the pressure on the walls of the blood vessels when the heart relaxes between beats.
The surface area of your lungs is about 1,000 square feet, 20 times more than the surface area of your skin. How does circulation in the lymphatic system differ from circulation in the circulatory system?
Besides the vessels and nodes, list three body organs that are part of the lymphatic system.
How are the two types of acquired immunity, natural immunity and artificial immunity, different? Inside of it, there are four different chambers: two atria stacked on top of two ventricles. So when the upper atria contract, the atrioventricular valves sandwiched between the atria and the ventricles open, and the blood in each atrium flows through its respective valve down into a ventricle. On the right side, where oxygen-depleted blood is passing into the right ventricle, it's known as the tricuspid valve.
Oxygen-depleted blood in the right ventricle leaves the heart through the pulmonary valve that connects to the pulmonary artery leading to the lungs. If the two measurements were 110 and 70, the blood pressure would be described as "one-ten over seventy". A high systolic pressure indicates strain on the blood vessels when the heart is attempting to pump blood.
Sustained high blood pressure can increase the risk of premature strokes and heart attacks. Each atrium is paired with a ventricle, and a wall separates them into two different shafts.

These valves leading out of the ventricles represent the heart's exit doors, and together they're known as the semilunar valves. Oxygen-rich blood in the left ventricle, meanwhile, departs through the aortic valve that connects the heart to the aorta, the body's major expressway for the delivery of freshly oxygenated blood. The frame of the tambourine represents the annulus, or the tough ring of tissue to which the valve's flaps are attached. Above age 20, most RBCs are produced primarily in the marrow of the vertebrae, the sternum, the ribs, and the pelvis. If the diastolic pressure is high, it means the blood vessels have little chance to relax between heartbeats.
On both the left side and the right side of the heart, blood enters the upper atrium, files through a valve into the ventricle and then exits through another valve on the way out of the heart. Once the passing electrical current contracts the ventricles, the blood inside them is forced through the open semilunar valves, which then slam shut.
Now imagine punching through the top of a tambourine and it splitting into three equal-sized pieces across the opening.
All of the valves have three cusps, except the mitral valve, which has two, but operates the same as the others.

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