When an Action Potential Arrives at an Axon Terminal, the Fusion

question 241

Multiple Choice

When an action potential arrives at an axon terminal, the fusion of neurotransmitter vesicles with the cell membrane is triggered by

• A) an increase in the concentration of calcium ions within the cell.
• B) the removal of calcium ions from the cytoplasm of the cell.
• C) the opening of K⁺ leak channels, which causes an increase in potassium ions within the cell.
• D) the release of acetylcholine.
• E) a sudden increase in chloride ions within the cytoplasm of the cell.

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