In the Synaptic End Bulb, the Action Potential Leads to the Release

question 31

Multiple Choice

In the synaptic end bulb, the action potential leads to the release of neurotransmitter. What links these two types of signals?

• A) The action potential triggers voltage-gated Na⁺ channels to open and the depolarization causes the vesicle walls to merge with the membrane.
• B) The action potential causes a change in the proteins on the vesicle membranes such that the vesicle binds to the cell membrane and begins exocytosis.
• C) The action potential triggers voltage-gated Ca²⁺ channels to open and the Ca²⁺ that flows in starts a cascade of protein reactions that allows exocytosis of the neurotransmitters.
• D) The action potential causes K⁺ to leave during repolarization and the decrease in K⁺ concentration triggers vesicles to bind to the membrane, releasing their contents.

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