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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.
Path of Blood Through the Heart. 1  The path of blood through the heart begins with the right atrium receiving blood, which has circulated through most of the body. 2  This blood is also relatively high in carbon dioxide, which is a product of metabolism in the tissues.