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Blood coming from all parts of the body is received by the (1) of the heart by way of the blood vessel is called (2) Contraction of the right atrium sends blood to the (3) At this point, the (4). valves are open. Contraction of the right ventricle forces blood to the (5) for oxygenation by way of the (6) At this point, the valves are open, while the (8) valves are closed to prevent the back flow of blood in the right atrium. From the lungs, oxygenated blood goes back to the(9 of the heart via the blood vessels called (10) Contraction of the left atrium forces blood to the (11) At this point the (12) are open. Contraction of the left ventricle pumps blood to the (13) by way of the (14), the largest artery. At this point, the (15) valves are open while the are closed to prevent the backflow of blood in the left atrium. (16)
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