Question

Permeability of which of the following increases during depolarization?

• A. $N{a}^{+}$
• B. $K^{+}$
• C. Both $N{a}^{+}$ and $K^{+}$
• D. None of the above

Answer 1

The correct option is A $N{a}^{+}$

Permeability of $N{a}^{+}$ ion increases during depolarization due to opening of $N{a}^{+}$ ion channels which allow rapid influx of sodium ions into the cell resulting in more positive charge inside the cell and more negative charge outside the cell leading to reversal of polarity.