After an action potential reaches a synaptic terminal, which of the following events would occur first? A) Synaptic vesicles fusing with the cell membrane. B) Membrane-bound Na⁺ channels opening. C) Neurotransmitter binding to membrane-bound receptors. D) Ca²⁺ entering the synaptic terminal. E) Release of the transmitter into the synaptic cleft.

Question

Quizplus · Accepted Answer

When an action potential reaches a synaptic terminal, the first event that occurs is the opening of voltage-gated calcium channels (Ca2+ entering the synaptic terminal), which triggers subsequent steps in neurotransmitter release.

After an Action Potential Reaches a Synaptic Terminal, Which of the Following