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What happens when the neuron reaches threshold (-55 mV)?
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11. Nervous Tissue and Nervous System
Action Potentials
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Which part of the action potential occurs when the voltage-gated Na+ channels are inactivating and voltage-gated K+ channels open?
A
resting state
B
depolarization
C
repolarization
D
hyperpolarization
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Understand the phases of an action potential: resting state, depolarization, repolarization, and hyperpolarization.
During depolarization, voltage-gated Na+ channels open, allowing Na+ ions to enter the cell, causing the membrane potential to become more positive.
Repolarization occurs when the voltage-gated Na+ channels begin to inactivate, stopping the influx of Na+ ions.
Simultaneously, voltage-gated K+ channels open, allowing K+ ions to exit the cell, which helps to return the membrane potential back towards the resting state.
Recognize that the opening of K+ channels and inactivation of Na+ channels are key events in the repolarization phase of the action potential.
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