Hyperpolarization occurs during an action potential because A. potassium channel
ID: 3513020 • Letter: H
Question
Hyperpolarization occurs during an action potential because
A. potassium channels close slowly during repolarization
B. some potassium channels begin to open as the membrane reaches its resting state
C. the inactivation gates of the sodium channels remain closed until the membrane potential reaches -90mV
D. chloride channels open and allow chloride ions to enter the cell
E. the sodium/potassium pump hasn't started working yet
A. potassium channels close slowly during repolarization
B. some potassium channels begin to open as the membrane reaches its resting state
C. the inactivation gates of the sodium channels remain closed until the membrane potential reaches -90mV
D. chloride channels open and allow chloride ions to enter the cell
E. the sodium/potassium pump hasn't started working yet
Explanation / Answer
Answer is A (potassium channels close slowly during repolarization )
The depolarization starts with fast the opening of sodium channels and Repolarization start with the rapid opening of voltage-gated potassium channels and develop negative charge in the cell. The closing of potassium channels during repolarization is slow and it takes more time than the time required to bring potential membrane normal resting level.
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