Diagram depicting circulation of blood through the heart. Blood returns from the tissues of the body via the superior vena cava and inferior vena cava. These two major venous vessels carry the blood to the right atrium. Blood then passes into the right ventricle and is pumped into the pulmonary trunk and next flows into pulmonary arteries that convey the blood to the lungs. The blood is oxygenated in the lungs and is then returned to the left atrium via the pulmonary veins. Blood then passes to the left ventricle and is pumped into the aorta, which conveys the blood to the tissues of the body. From the heart to the lungs and from the lungs to the heart constitutes the pulmonary circulation from the heart to the tissues and from the tissues to the heart constitutes the systemic circulation.
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