9. The critical function of the sodium-potassium pump of neurons is to move
(A)Na⁺ and K⁺ into the cell.
(B)Na⁺ and K⁺ out of the cell.
(C)Na⁺ into the cell and K⁺ out of the cell.
(D) Na⁺ out of the cell and K⁺ into the cell.
(E) Na⁺ and K⁺ into the cell and H+ out of the cell through an antiport mechanism.

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