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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.
Blood flows through your heart and lungs in four steps: 1  The right atrium receives oxygen-poor blood from the body and pumps it to the right ventricle through the tricuspid valve. 2  The right ventricle pumps the oxygen-poor blood to the lungs through the pulmonary valve.