The sodium-potassium ion exchange pump
A)is not involved in producing the resting membrane 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 opposite to the direction of their electrochemical gradients.
E)depends on a hydrogen gradient for energy.

Question

Quizplus · Accepted Answer

The sodium-potassium ion exchange pump actively moves sodium and potassium ions against their respective electrochemical gradients, using ATP for energy. This means sodium ions are pumped out of the cell, while potassium ions are pumped into the cell, which is opposite to their natural direction of movement based on their gradients.

The Sodium-Potassium Ion Exchange Pump