Blood enters the right atrium of the heart and is pumped to the right ventricle, which in turn pumps blood to the lungs. The pulmonary artery then carries the oxygen-poor blood from the heart to the lungs. The lungs add oxygen to the blood.
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Blood enters the right atrium of the heart and is pumped to the right ventricle, which in turn pumps blood to the lungs. The pulmonary artery then carries the oxygen-poor blood from the heart to the lungs. The lungs add oxygen to the blood.
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