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

Question

Quizplus · Accepted Answer

When acetylcholine stimulates its receptors in the neuromuscular junction, it increases the permeability of the sarcolemma to Na+. This leads to depolarization of the muscle fiber and the initiation of an action potential.

What Happens When Acetylcholine Stimulates Its Receptors in the Neuromuscular