At the normal resting membrane potential of a typical neuron, its sodium-potassium exchange pump transports
A) 1 intracellular sodium ion for 2 extracellular potassium ions.
B) 2 intracellular sodium ions for 1 extracellular potassium ion.
C) 3 intracellular sodium ions for 1 extracellular potassium ion.
D) 3 intracellular sodium ions for 2 extracellular potassium ions.
E) 3 extracellular sodium ions for 2 intracellular potassium ions.

Question

Quizplus · Accepted Answer

The sodium-potassium pump (Na+/K+ ATPase) actively transports 3 intracellular sodium ions out of the cell and 2 extracellular potassium ions into the cell, using ATP to maintain the resting membrane potential and concentration gradients of these ions.

At the Normal Resting Membrane Potential of a Typical Neuron