When an Action Potential Reaches a Synaptic Terminal at the End

Question

When an action potential reaches a synaptic terminal at the end of presynaptic neurons, _______.
A) sodium-potassium pumps release sodium into the synaptic cleft
B) calcium ions enter the synaptic terminal and cause synaptic vesicles to release neurotransmitter into the synaptic cleft
C) neurotransmitter binds to receptors on the presynaptic neuron
D) the postsynaptic neuron releases neurotransmitter

Accepted Answer

When an action potential reaches a synaptic terminal, it causes calcium ions to enter the synaptic terminal, which triggers the release of neurotransmitter from synaptic vesicles into the synaptic cleft.