Which of the following events restores the membrane potential from the peak of the action potential back to the resting level?
A) Sodium ions move into the cell.
B) Potassium ions move out of the cell.
C) Potassium ions move into the cell.
D) Chloride ions move into the cell.
E) Chloride ions are extruded from the cell.
Answer: B
Rationale: Movement of potassium ions out of the cell restores the membrane potential to baseline from the peak of the action potential.
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