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Why does the heart automatically adjust the flow of blood to match activity levels? A. Extreme activity damages blood cells and the body needs replacements. B. The heart requires more oxygen when
exercising. C. It builds up a higher level of oxygen in the blood. D. Organs and muscles require more blood under stress. Please select the best answer from the choices provided.
It builds up a higher level of oxygen in the blood.
Expert answered|jeifunk|Points 8431|
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Asked 1/18/2013 10:59:56 AM
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