Circulatory system of heart and lungs, computer artwork. The heart (centre) is a hollow muscle that pumps blood around the body. The two branches of the pulmonary artery (red) carry deoxygenated blood from the heart to the lungs. Oxygenated blood returns from the lungs in the two branches of the pulmonary vein (blue-violet). Also shown are the lobes of the lungs.
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