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An action potential arriving at the presynaptic terminal causes what to occur? multiple choice voltage-gated calcium ion channels open, and calcium ions diffuse into the cell. voltage-gated sodium ion channels open, and sodium ions diffuse into the cell. acetylcholine diffuses into the cell. ligand-gated sodium channels open, and sodium ions diffuse out of the cell. voltage-gated sodium ion channels open, and sodium ions diffuse out of the cell.

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The answer to this question would be: calcium ions to diffuse into the cell.

The presynaptic neuron would need to release neurotransmitter to the postsynaptic neuron. To do this, the action potential will cause calcium ion diffuse into the cell causing the vesicle with the neurotransmitter to migrate to the cell membrane and release its content. 

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