The acetylcholine receptor is restored to its normal closed position by A) diffusion of excess acetylcholine out of the synapse. B) movement of Na⁺ ions into the muscle cell. C) movement of Na⁺ ions out of the muscle cell. D) exocytosis of acetylcholine. E) the activity of acetylcholinesterase.

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Quizplus · Accepted Answer

Acetylcholinesterase is the enzyme responsible for breaking down acetylcholine in the synaptic cleft. By breaking down the acetylcholine, the receptor is no longer stimulated and can return to its normal closed position.

The Acetylcholine Receptor Is Restored to Its Normal Closed Position