Which Statement About Smooth Muscle Is True

question 23

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.