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

All of the following are true concerning smooth muscle EXCEPT:

A.  Smooth muscle contractions are longer and slower than skeletal muscle contractions.
B.  A chemical change in the environment around smooth muscle may create 'a contraction.
C.  Smooth muscle does not require calcium to contract.
D.  Smooth muscle is usually involuntary.

C is correct. Smooth muscle contains thick and thin filaments, so it requires calcium to contract.