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MCAT Question A Day - 9/13/14 - Answer!

In extreme cold, just before the onset of frostbite, sudden vasodilation occurs manifested in flush skin. This vasodilation is most likely the result of:

A.  paralysis of smooth muscle in the vascular walls.
B.  paralysis of skeletal muscle surrounding the vascular walls.
C.  sudden tachycardia with a resultant increase in blood pressure.
D.  blood shunting due to smooth muscle sphincters.

A is correct. Thc word dilation here is the give away. Smooth muscle must be relaxing in order to dilate the vessels.

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