Which of the following is the most direct result of depolarizing the presynaptic membrane of an axon terminal?
a. Voltage-gated calcium channels in the membrane open.
b. Synaptic vesicles fuse with the membrane.
c. Ligand-gated channels open, allowing neurotransmitters to enter the synaptic cleft.
d. An EPSP or IPSP is generated in the postsynaptic cell.
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