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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.
How Blood Flows Through the Heart. Blood enters the heart through the right atrium. This blood from the veins (venous blood) has already traveled through the body and delivered oxygen to the organs and tissues. By the time the blood reaches the heart again, it is loaded with carbon dioxide. The venous blood enters the right atrium.