Na+ diffusion will result in

Na+ diffusion will result in

• A. More positive charges on inside the cell
• B. More negative charges on inside the cell
• C. No net charge change inside
• D. More positive charges on outside

Answer: (A)

When a positively charged ion like sodium moves into the cell, it brings positive charge with it. Influx of Na+ increases the amount of positive charge inside the cytoplasm, making the interior less negative (depolarized) relative to the outside. That’s why inward diffusion of Na+ is associated with more positive charges on the inside. The other statements don’t fit because Na+ moving inward adds positive charge inside (not negative), it does change the net charge distribution (not zero), and the immediate effect is not that the outside becomes more positive—rather, it loses some positive charge as Na+ enters.

When a positively charged ion like sodium moves into the cell, it brings positive charge with it. Influx of Na+ increases the amount of positive charge inside the cytoplasm, making the interior less negative (depolarized) relative to the outside. That’s why inward diffusion of Na+ is associated with more positive charges on the inside. The other statements don’t fit because Na+ moving inward adds positive charge inside (not negative), it does change the net charge distribution (not zero), and the immediate effect is not that the outside becomes more positive—rather, it loses some positive charge as Na+ enters.