The Acetylcholine Receptor Is Restored to Its Normal Closed Position

Multiple Choice

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.