What happens when acetylcholine stimulates its receptors in the neuromuscular junction?
A. The permeability of the sarcolemma to Na+ increases.
B. The release of Ca2+ from the sarcoplasmic reticulum decreases.
C. The threshold of the muscle fiber lowers.
D. The positive charge on the sarcolemma decreases.
E. The inhibitory effect of acetylcholinesterase is overridden.
Answer: A
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