The acetylcholine receptor is restored to its normal closed position by A) an action potential. B) active transport of Na⁺and K⁺. C) the breakdown of acetylcholine by acetylcholinesterase. D) exocytosis of acetylcholine. E) closing of Ca²⁺ channels.

Question

Quizplus · Accepted Answer

The breakdown of acetylcholine by acetylcholinesterase is necessary for the acetylcholine receptor to return to its normal closed position. Without the breakdown of acetylcholine, the receptor would remain in its open state, leading to continuous depolarization of the postsynaptic membrane.

The Acetylcholine Receptor Is Restored to Its Normal Closed Position