Once a membrane potential has been developed, the force that drives a particular ion across the membrane is its
A) electrical gradient.
B) electrochemical gradient.
C) concentration gradient.
D) electrogenic pump.
E) chemical gradient.

Question

Quizplus · Accepted Answer

The electrochemical gradient is the correct answer because it encompasses both the concentration gradient (difference in solute concentration across a membrane) and the electrical gradient (difference in charge across a membrane), which together determine the direction and magnitude of ion movement across the membrane.

Once a Membrane Potential Has Been Developed, the Force That