If the voltmeter shows a neuron's membrane potential becomes more negative, from -70 mV to -85 mV, then the neuron is experiencing a hyperpolarization phase.
The hyperpolarization phase is a stage in which potassium channels remain open while sodium channels need to reset.
This causes a change in the voltage inside the cell, which triggers a concomitant response.
The period of hyperpolarization is inversely opposite to the depolarization state of the neuron.
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