The sodium-potassium exchange pump
A) must re-establish ion concentrations after each action potential.
B) transports sodium ions into the cell during depolarization.
C) transports potassium ions out of the cell during repolarization.
D) moves sodium and potassium in the direction of their chemical gradients.
E) requires ATP to function.

Question

Quizplus · Accepted Answer

The sodium-potassium exchange pump requires ATP to function. It moves three sodium ions out of the cell and two potassium ions into the cell, against their concentration gradients. This helps to maintain the resting membrane potential and is vital for normal cell function.

The Sodium-Potassium Exchange Pump