Blood flows from the heart to the lungs in the pulmonary artery and returns 1 point from the lungs to the heart in the pulmonary vein. The blood in the
pulmonary artery is

The pulmonary artery carries deoxygenated blood from the right ventricle to the lungs. The blood here passes through capillaries adjacent to alveoli and becomes oxygenated as part of the process of respiration. In contrast to the pulmonary arteries, the bronchial arteries supply nutrition to the lungs themselves.

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