After the Peak of an Action Potential, What Prevents Sodium

question 24

Multiple Choice

 After the peak of an action potential, what prevents sodium ions from continuing to enter the cell?

• A) There is no longer a concentration gradient for sodium.
• B) The sodium-potassium pump greatly increases its rate of activity.
• C) All the available sodium ions have already entered the cell.
• D) The sodium gates in the membrane close.

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