Which is TRUE about the Na+, K+ ATPase pump in neurons?
A. It maintains an electrical gradient at the equilibrium potential of K+.
B. It pumps 3 Na+ ions into the cell for every 2 K+ ions it pumps out.
C. It transports equal numbers of sodium and potassium ions with each pump cycle.
D. It maintains a concentration gradient for K+ such that diffusion forces favor movement of K+ into the cell.
E. It generates a small electrical potential such that the inside is made negative with respect to the outside.
Answer: E
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