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.

Question

Quizplus · Accepted Answer

The sodium-potassium pump of neurons moves Na+ ions out of the cell (against their concentration gradient) and K+ ions into the cell (also against their concentration gradient). This is accomplished through the hydrolysis of ATP, which powers the pump's active transport mechanism. Choice D correctly identifies that the pump moves Na+ out and K+ into the cell. Choices A, B, C, and E are incorrect because they either incorrectly include both ions moving in one direction, include a third molecule (such as H+), or include no movement of either ion.

The Critical Function of the Sodium-Potassium Pump of Neurons Is