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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.
Route of Blood Flow Through the Heart. 1  The left and right sides of the heart can be considered as separate pumps. 2  Blood flows from the systemic vessels to the right atrium and from the right atrium to the right ventricle.