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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.
Sec. 2 Explain how blood moves through the heart. The blood flows from an atrium to a ventricle, then from a ventricle into a blood vessel. A wall between the two atriums or the two ventricles keeps blood rich in oxygen separate from blood low in oxygen.