The arrival of an action potential at a synaptic terminal causes voltage-gated potassium channels to open.

Name: The arrival of an action potential at a synaptic terminal causes voltage-gated potassium channels to open.
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The arrival of an action potential at a synaptic terminal causes voltage-gated calcium channels to open, not potassium channels. This influx of calcium ions triggers the release of neurotransmitters into the synaptic cleft.

The Arrival of an Action Potential at a Synaptic Terminal