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From there, the blood leaves the heart through the aorta to be distributed throughout the body. Blood enters the heart through the superior and inferior venae cavae into the right atrium. This blood then flows through the right atrioventricular valve to the right ventricle.
Then the blood goes back to the heart and the heart pumps the oxygen rich blood out to the entire body. Blood flows through arteries going out from the heart to various parts of the body, and through veins on the way back to the heart. The heart pumps blood by the rhythmic contraction of the four chambers in the heart.