Question

when a neuron is at rest, there is more ______ on the inside of the cell than on the outside, and more ______ on the outside than on the inside.
a potassium; sodium
b sodium; potassium
c calcium; sodium
d potassium; calcium

Explanation:

At rest, a neuron has a higher concentration of potassium ions inside the cell and a higher concentration of sodium ions outside the cell due to the action of the sodium - potassium pump.

Answer:

A. potassium; sodium