The document describes the anatomy and function of the heart. It includes diagrams of the heart showing the four chambers and major blood vessels. The heart pumps oxygenated blood from the left ventricle through the aorta and deoxygenated blood from the right ventricle to the pulmonary artery. The heart receives deoxygenated blood from the superior and inferior vena cava into the right atrium and pumps it to the lungs, and receives oxygenated blood back from the lungs into the left atrium to pump through the body.