Which of the following statements is not true concerning acetylcholine's function?
A. In the PNS, acetylcholine excites skeletal muscle.
B. Acetylcholine has an excitatory effect on smooth muscle and glands.
C. In the PNS, acetylcholine inhibits cardiac muscle.
D. The enzyme acetylcholinesterase removes acetylcholine from the receiving cell's membrane.
E. Acetylcholine is active in both the CNS and PNS.
Answer: B
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