The activity of acetylcholine in a synapse is terminated by its ________.
A) active transport across the presynaptic membrane
B) diffusion across the presynaptic membrane
C) active transport across the postsynaptic membrane
D) diffusion across the postsynaptic membrane
E) degradation on the postsynaptic membrane

Question

Quizplus · Accepted Answer

Acetylcholine is terminated in a synapse by its degradation on the postsynaptic membrane by the enzyme acetylcholinesterase. This enzyme breaks down acetylcholine into choline and acetate, which are taken back up into the presynaptic neuron to be recycled for the synthesis of new acetylcholine.

The Activity of Acetylcholine in a Synapse Is Terminated by Its