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chadnawad chadnawad
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13 years ago
Which of the following occurs during REpolarization?

A) Voltage-gated potassium channels open and potassium flows into the cell.
B) Voltage-gated sodium channels open. Sodium flows into the cell.
C) Voltage-gated sodium channels open and some voltage-gated potassium channels inactivate. Sodium flows out of the cell.
D) Voltage-gated potassium channels open and some voltage-gated sodium channels inactivate. Potassium flows out of the cell.
E) Voltage-gated potassium channels remain open and some voltage-gated sodium channels inactivate. Potassium flows into the cell.
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#1
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13 years ago
During repolarization, voltage-gated sodium ion channels inactivate (different from the close state) due to the now-depolarized membrane, and voltage-gated potassium channels activate (open). Both the closing of the sodium ion channels and the opening of the potassium ion channels act to repolarize the cell's membrane potential back to its resting membrane potential.
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