Heart. Computer illustration of a wire-frame model of a healthy human heart. This organ is a hollow muscle that pumps blood around the body. The vena cava (upper left) carries deoxygenated blood into the heart from the body. This blood then travels from the heart to the lungs and back through the pulmonary blood vessels (centre right) to obtain oxygen. The arched aorta (upper centre) is the large artery through which oxygenated blood travels back to the body from the heart.
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