How is excess Na+ prevented from depolarizing a neuron at resting potential?
a. Cl- enters the cell through diffusion and electrostatic pressure to balance out the membrane potential
b. The Na+/K+ pump uses active transport to move excess Na+ against its concentration gradient to the outside of the cell
c. Although Na+ wants to naturally diffuse into the cell, electrostatic pressure prevents it from entering
d. K+ exits the cell via diffusion and electrostatic pressure to balance out the membrane potential
Answer: b. The Na+/K+ pump uses active transport to move excess Na+ against its concentration gradient to the outside of the cell
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