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In the resting state of the neural membrane, diffusion due to concentration gradients, if allowed, would drive

1. K+ into the cell
2. K+ and Na+ out of the cell
3. Na+ into the cell
4. Na+ out of the cell

Correct answer: Na+ into the cell

Solution

At rest, sodium concentration is much higher outside the cell than inside, so if only diffusion acted, Na+ would move inward down its gradient. Potassium is the opposite: it tends to diffuse out, not in.

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