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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.
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The heart automatically adjusts the flow of blood to match activity levels because: it builds up a higher level of oxygen in the blood.
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Asked 11/12/2014 10:19:39 AM
Updated 11/12/2014 8:39:33 PM
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The heart automatically adjusts the flow of blood to match activity levels because: it builds up a higher level of oxygen in the blood.


Added 11/12/2014 8:39:33 PM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [11/12/2014 8:42:25 PM]
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Psychologists use a systematic method to conduct psychological research in order to increase consistency across studies. true or false
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Updated 9/15/2016 8:30:03 PM
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Psychologists use a systematic method to conduct psychological research in order to increase consistency across studies. TRUE.
Added 9/15/2016 8:30:03 PM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [9/15/2016 8:34:15 PM]
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