What happens when the action potential reaches the terminal button?
A) The signal terminates, or ends.
B) The signal causes the vesicles to release neurotransmitter.
C) The terminal button sends it down the axon.
D) The signal causes reuptake of neurotransmitters in the synapse.

Question

Quizplus · Accepted Answer

When the action potential reaches the terminal button, the voltage-gated calcium channels open and calcium ions rush into the cell. This increase in calcium triggers the vesicles in the presynaptic neuron to release neurotransmitter into the synaptic cleft, where it can then bind to receptors on the postsynaptic neuron and continue the signal transmission.

What Happens When the Action Potential Reaches the Terminal Button