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

Question

Quizplus · Accepted Answer

Calcium ion channels in the axon terminal must open first to allow calcium ions to enter the axon terminal, ultimately causing the release of neurotransmitters from the synaptic vesicles.

Which of the Following Must Happen First in the Order