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The pulmonary artery leads from the large right ventricle of the heart to the lungs. It is one of the largest blood vessels in the body. It is unique among arteries in that it does not carry oxygenated blood. Instead, it carries de-oxygenated blood back to the lungs to be re-oxygenated and returned to the heart through the pulmonary vein to be distributed to the rest of the body.