10 Questions
What is the state of voltage-gated sodium channels at rest?
Closed
What contributes to the depolarization phase of the action potential?
Influx of sodium ions
What triggers the opening of more voltage-gated sodium channels?
Depolarization reaching a certain threshold
What is the main contribution to the repolarization phase?
Efflux of potassium ions
What restores the negative charge inside the neuron during repolarization?
Efflux of positive ions (potassium)
What is the main factor contributing to the depolarization phase of the action potential?
Influx of positive sodium ions
What triggers the opening of more voltage-gated sodium channels during the action potential?
Depolarization reaching a certain threshold
What causes the repolarization phase of the action potential?
Efflux of positive potassium ions
What is the state of voltage-gated sodium channels at rest?
Closed
What is the main contribution to maintaining the resting membrane potential?
Some potassium (K+) channels being open
Test your knowledge of neuronal action potential and ionic channels with this quiz. Learn about the changes in ionic channels that underlie the action potential, including the resting state and depolarization phase of a neuron.
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