The Release of Acetylcholine from the Terminal of a Motor

Multiple Choice

The release of acetylcholine from the terminal of a motor neuron is most directly linked to

A) the entry of potassium into the axon terminal.
B) the exit of potassium from the axon terminal.
C) the entry of sodium into the axon terminal.
D) the exit of sodium from the axon terminal.
E) the entry of calcium into the axon terminal.