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