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Circulation is the system of shunting blood throughout the body. The blood returns to the heart from systemic - or full body - circulation via the superior and inferior vena cavae - or the biggest veins in the body - and goes straight into the right atrium, an upper chamber of the heart. from there it passes through the tricuspid valve into the right ventricle, or lower chamber of the heart, and goes to the lungs through the pulmonary artery. notice that arteries always carry blood from the heart to body tissues, while veins always carry blood from tissues back to the heart. in the lungs, the blood receives oxygen - or becomes oxygenated - and goes back to the heart via the pulmonary veins into the left atrium, through the mitral or bicuspid valve, into the left ventricle, and into the aorta, or the biggest artery in the body, to be shunted throughout systemic circulation to ensure that the entire body receives oxygen so that no tissue dies.

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