circulatory system The system that moves blood through the body. The circulatory system is composed of the heart, arteries, capillaries, and veins. This remarkable system transports oxygenated blood from the lungs to the heart and throughout the body via the arteries. The blood goes from the arteries to the veins by passing through the capillaries. Then the blood that has been depleted of oxygen by the body is returned to the lungs and heart via the veins. See also artery; blood; heart; lung; respiratory system; vein.

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