JACOPIN / SCIENCE PHOTO LIBRARY JACOPIN / SCIENCE PHOTO LIBRARY
BLOOD CIRCULATION, ILLUSTRATION The circulatory pumps. Illustration of the four types of pumps which send venous blood back toward the heart: From left to right: - the cardiac pump, which sends deoxygenated blood to the lungs for reoxygenation - the plantar pump, which sends venous blood from the foot to the calf - the muscular pump in the calf, which sends venous blood to the inferior vena cava - the diaphragmatic pump, which sends blood from the inferior vena cava to the heart.
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