An action potential is triggered if the membrane potential at the axon hillock is depolarized to threshold.

Name: An action potential is triggered if the membrane potential at the axon hillock is depolarized to threshold.
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An action potential is initiated when the membrane potential at the axon hillock is depolarized to a certain threshold level, typically around -55 mV, allowing voltage-gated sodium channels to open and further depolarize the membrane.

An Action Potential Is Triggered If the Membrane Potential at the Axon