ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Heart, wire-frame computer artwork. The heart is a muscular pump that circulates blood around the body, providing all tissues with oxygen and nutrients. Pulmonary arteries and veins (some seen at upper right) take blood to and from the lungs, where it is oxygenated and carbon dioxide released for exhalation. Blood arrives at the heart from the body through the vena cava (down left). It is pumped through the lungs before returning to the heart and being pumped to the body through the aorta (arch at top centre). Three arteries branch off this at top, then the aorta turns downwards behind the heart to supply the lower body.
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