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MCAT Question A Day - 8/31/14 - Answer!

Shivering increases body temperature by:

A.  serving as a warning that body temperature is too low, prompting the person to seek warmer locations.
B.  causing bones to rub together, creating heat througfriction.
C.  increasing the activity of muscles.
D.  convincing the hypothalamus that body temperature is higher than it actually is.

C is correct. Shivering results from the increase of muscle tone. When muscle tone increases beyond certain critical point, it creates the familiar indiscriminate muscle activity typical of shivering. While shivering may serve as a warning, it does more than that, and that is not its primary purpose; A is out. is simply not the case, nor is D.

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