Which of the following events restores the membrane potential ...

[kamilo84]

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.

Question 2

Which of the following is a consequence of the activity of the sodium-potassium transporters?
 
  A) Extracellular sodium concentrations are kept low.
  B) Intracellular sodium concentrations are kept very high.
  C) Extracellular potassium concentrations are kept very high.
  D) Intracellular sodium concentrations are kept low.
  E) Little energy is required to maintain ionic differences across the membrane.

[flannelavenger]

Answer to Question 1

Answer: B
Rationale: Movement of potassium ions out of the cell restores the membrane potential to baseline from the peak of the action potential.

Answer to Question 2

Answer: D
Rationale: As a consequence of the activity of the sodium-potassium transporters, intracellular sodium concentrations are kept low.