In the human body with the heart acting pump blood circulation in blood vessel. Blood pumping of the heart, causing blood to flow pressure according to the blood to different parts of the body and flows back to the heart by heart, we are located in the chest, between the lungs, both left align the walls through relatively thoracic is divided into 4 rooms on two rooms. There are walls of the Atrium (atrium), a large room bottom and thick over the so-called Wien tree bin (ventricle) between the two halves on the bottom, there will be a closed-open heart forward to prevent back flow of blood.
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