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MCAT Question A Day - 9/10/14 - Answer!

Which of the following muscles is under voluntary control?

A.  the diaphragm
B.  the heart
C.  the smooth muscle of the large intestines
D.  the iris

A is correct. This question asks you to recognize that smooth muscle and cardiac muscle are involuntary, and then to recognize muscle types of the different structures. Of the muscles listed, only the diaphragm is skeletal muscle.

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