CARLYN IVERSON / SCIENCE PHOTO LIBRARY CARLYN IVERSON / SCIENCE PHOTO LIBRARY
Human heart. Artwork of an external view of a healthy human heart, the hollow muscle that pumps blood around the body. The main blood vessels of the heart are visible at the top of the image. At upper and lower left (blue) is the vena cava, which carries blood from the body. This blood is pumped to the lungs and back to the heart through the pulmonary blood vessels (mauve). Oxygenated blood is then pumped by the other heart chambers to the rest of the body through the main artery, the aorta (red). The heart muscle is supplied with blood through the coronary arteries (red) seen on the surface of the heart.
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