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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.
A SCAI answered. To understand how blood travels through the human body, we can begin in the heart. The heart is divided into four chambers: the upper chambers, called the left and right atria, and the lower chambers, which are called the left and right ventricles.