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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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What distinguishes a heart attack from heart failure. A. A heart attack results from poor blood flow, while heart failure involves a total interruption of blood flow. B. Both heart attack and heart failure result in heart tissue death, but more tissue dies as a result of heart failure. C. Heart tissue dies during a heart attack, while heart failure results in systemic oxygen deficiency. D. Heart failure results in body tissues receiving such a high level of oxygen that it is toxic. Please ...
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