ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Human heart. Computer artwork depicting a healthy heart, with a glow. At top the heart's main blood vessels are: superior vena cava (white), aorta (arching, orange). The heart pumps blood around the body. It is made up of four chambers: two atria (orange, centre left and right) and two ventricles (red). The atrium and ventricle on the left side (at right on image) receive oxygenated blood from the lungs and pump it to the body through the aorta. Blood drained from the body is pumped through the right side of the heart to the lungs, where carbon dioxide is expelled and oxygen is taken up. Special conduction mechanisms in the heart muscle maintain its rhythmic pumping.
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