The document describes the anatomy and blood flow through the heart. It lists the major blood vessels and chambers of the heart, including the superior and inferior vena cava, right and left atria and ventricles, pulmonary trunk, aorta, and valves such as the tricuspid, pulmonary and aortic semilunar valves. Arrows show the path of blood flow from the venae cavae and pulmonary veins into the right atrium and ventricle, then into the pulmonary trunk to the lungs, and from the lungs through the pulmonary veins into the left atrium and ventricle, then out the aorta.