Blood enters the left atrium through the pulmonary veins before moving to the left ventricle. Blood then enters the systemic circuit and out the aorta. After dispersal throughout the body, the blood reenters the heart through the vena cavas, which leads to the right atrium. The blood then passes through the AV valve before reaching the right ventricle and being delivered to the lungs via the pulmonary arteries.
Work Step by Step