Which of the following must happen first in the order events at a chemical synapse?
A) Neurotransmitter binds to receptors on the postsynaptic neuron.
B) Ion channels respond to the neurotransmitter and lead to a local potential, or possibly an action potential.
C) Calcium ion channels in the axon terminal open.
D) Calcium ions cause synaptic vesicles to release neurotransmitters into the synaptic cleft.

Question

Quizplus · Accepted Answer

Calcium ion channels in the axon terminal open first, allowing calcium ions to enter the neuron, which then triggers the release of neurotransmitters into the synaptic cleft.

Which of the Following Must Happen First in the Order