Which Statement About Smooth Muscle Is True

Multiple Choice

Which statement about smooth muscle is true?

A) Acetylcholine decreases the likelihood of contraction of smooth muscle cells of the gut.
B) Smooth muscle contraction is controlled by the same troponin-tropomyosin mechanism as skeletal muscle.
C) Norepinephrine increases the likelihood of contraction of smooth muscle cells of the gut.
D) Action potentials, hormones, and stretching can cause an influx of calcium into the sarcoplasm of smooth muscles.
E) Norepinephrine causes smooth muscle cells of the arteries serving the gut to relax.