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The heart is a beating muscle that pumps oxygenated blood to the entire body. After leaving the heart, blood must first pass through the lungs to receive oxygen before it can go to the body's cells.

In order for blood to move from the heart to the lungs, blood must travel through the pulmonary artery and then into smaller and smaller vessels of the lungs.

The diameter, or tone, of these blood vessels is regulated by ... more