Question

During depolarisation/impulse transmission, permeability of neuron increases towards

• A. $H^{+}$
• B. N$a^{+}$
• C. A$g^{+}$
• D. M$g^{2+}$

Answer 1

Answer: (B)

N$a^{+}$

• During the depolarization of a neuron, the permeability of the neuronal membrane increases towards Na${}^{+}$ ions.
• Sodium ions move into the cell due to the opening of the voltage-gated sodium channels resulting in higher positive charge in the interior and hence depolarisation of the cell.

So the correct answer is 'Na${}^{+}$'.