The threshold of excitation during an action potential is approximately -55mV.

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During the action potential, the electrical charge across the membrane changes dramatically. The millivolts through the phases are approximately -70mV at resting potential, -55mV at threshold of excitation, 30mV at peak action potential, 5mV at repolarization, and -80mV at hyperpolarization.

Action Potential Voltage Phases

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

The resting potential of a neuron membrane is approximately -70mV.

Resting Potential Voltage

Threshold of Excitation Voltage

The peak action potential is approximately 30mV.

Peak Action Potential Voltage

During the repolarization phase of an action potential, the membrane potential passes through approximately 5mV.

Repolarization Voltage

During the hyperpolarization phase of an action potential, the membrane potential is approximately -80mV.

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