Which of these causes the release of neurotransmitter molecules?

Question

Question: Which of these causes the release of neurotransmitter molecules?

Options:

1.  An action potential reaching the end of the axon
2.  An action potential reaching the end of the dendrite
3.  An action potential reaching the end of the cell body
4.  The receipt of a signal from the postsynaptic neuron
5.  The opening of voltage-regulated calcium channels and the diffusion of calcium ions out of the neuron

Answer 1

1. An action potential reaching the end of the axon

An action potential reaching the end of the axon causes the release of neurotransmitter molecules.