Question

The depolarization of nerve membrane takes place through influx of .......... ions.

• A. Calcium
• B. Potassium
• C. Sodium
• D. Magnesium

Answer 1

The correct option is C Sodium

The sodium-potassium pump is involved in the movement of the sodium and potassium ions across the cell membrane. The inside membrane becomes negative due to the movement of $K^{+}$ ions outwards. This results in the opening of gated $N{a}^{+}$ channels causing an influx of $N{a}^{+}$ ions causing depolarization. Thus the correct answer is option C.