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

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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

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

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.

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