Which list of words describes an action potential?

An action potential is a brief electrical signal produced by a change in a neuron's membrane potential. It follows the all-or-none rule: once the threshold is reached, the action potential occurs fully; if threshold is not reached, it does not occur. Neurotransmitters are chemical messengers, not a description of the action potential itself, so the list “all or none, membrane potential, electrical signals” is correct.

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