Which of the following presynaptic events are in correct chronological order?
A) calcium ion influx,action potential reaches axon terminal,vesicle fuses with membrane,diffusion of neurotransmitter
B) action potential reaches axon terminal,calcium ion channels open,exocytosis,diffusion of neurotransmitter
C) exocytosis,calcium ion influx,action potential reaches axon terminal,membrane depolarization
D) action potential reaches axon terminal,calcium ion channels open,neurotransmitter diffusion,exocytosis

Question

Quizplus · Accepted Answer

The correct chronological order for presynaptic events is as follows:
1. Action potential reaches axon terminal
2. Calcium ion channels open
3. Exocytosis (vesicles release neurotransmitter into the synaptic cleft)
4. Diffusion of neurotransmitter across the synaptic cleft to the postsynaptic membrane receptors. Choice B is the only sequence that follows correct chronological order.

Which of the Following Presynaptic Events Are in Correct Chronological