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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A is correct. Thc word dilation here is the give away. Smooth muscle must be relaxing in order to dilate the vessels.
Want more questions? - Click here to check out our MCAT Question A Day archive
