Question

When an action potential reaches a neuromuscular junction, which of the following will happen first?
A)Acetylcholine binds to acetylcholinesterase and depolarizes the cell.
B)Sodium ion gates and potassium ion gates open at the same time.
C)Acetylcholine enters into the synapse to bond with receptor proteins.
D)Vesicles containing acetylcholine fuse with the presynaptic membrane

Answer 1

Answer:

A if the cell mentioned in the question is the neuron if not its D

Explanation:

Its A because depolarization should take place first for the action potential to move.

If the cell in the question is the muscular cell then, the answer is D as Vesicles containing acetylcholine should reach the presynaptic membrane(neuron membrane) to be released to the synapse and go into the postsynaptic membrane(muscular membrane)

As for the gates both of them cannot open at the same time as far as I guess so.