The activity of acetylcholine in a synapse is terminated by its
A)active transport out of the synaptic cleft.
B)diffusion across the presynaptic membrane.
C)active transport across the postsynaptic membrane.
D)diffusion across the postsynaptic membrane.
E)degradation by a hydrolytic enzyme in the synaptic cleft.

Question

Quizplus · Accepted Answer

Acetylcholine is degraded by the hydrolytic enzyme acetylcholinesterase in the synaptic cleft, thereby terminating its activity in the synapse. The other options listed do not play a significant role in terminating the activity of acetylcholine in a synapse.

The Activity of Acetylcholine in a Synapse Is Terminated by Its