Question

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

• A. K+ and Na+ out of the cell
• B. Na+ into the cell
• C. Na+ out of the cell
• D. K+ into the cell

Answer 1

Answer: (B)

Na+ into the cell

Answer 2

In the resting state of neurons, if ion diffusion is permitted owing to a concentration gradient, it would result in the movement of sodium ions (Na+) into the cell. This occurs because, during the resting state, the concentration of sodium ions inside the nerve cell is lower compared to the external environment. Conversely, the concentration of potassium ions (K+) is higher inside the cell than outside. Since diffusion involves ions moving from regions of higher concentration to lower concentration, sodium ions will move into the cell, while potassium ions will move out of the cell.