Which of the following is the correct order of events that occur at a cholinergic synapse? 1. Extracellular calcium enters the axon terminal, triggering the exocytosis of acetylcholine.
2) Acetylcholine is removed by acetylcholinesterase.
3) Acetylcholine binds to receptors and depolarizes the postsynaptic membrane.
4) Axon terminal depolarizes.
A) 2, 3, 1, 4
B) 1, 4, 3, 2
C) 4, 1, 2, 3
D) 3, 4, 1, 2
E) 4, 1, 3, 2

Question

Quizplus · Accepted Answer

The correct sequence for events at a cholinergic synapse starts with the depolarization of the axon terminal (4), which leads to the entry of extracellular calcium (1). This triggers the release of acetylcholine, which then binds to receptors on the postsynaptic membrane, causing it to depolarize (3). Finally, acetylcholine is broken down by acetylcholinesterase (2).

Which of the Following Is the Correct Order of Events