Question

When a neuron is in resting state, i.e., not conducting any impulse, the axonal membrane is:

• A. Comparatively more permeable of $K^{+}$ ions and nearly impermeable to $N{a}^{+}$ ions
• B. Comparatively more permeable to $N{a}^{+}$ ions and nearly impermeable to $K^{+}$ ions
• C. Equally permeable to both $N{a}^{+}$ and $K^{+}$ ions
• D. Impermeable to both $N{a}^{+}$ and $K^{+}$ ions

Answer 1

The correct option is A Comparatively more permeable of $K^{+}$ ions and nearly impermeable to $N{a}^{+}$ ions

Gated ion channels are present on the axonal membranes of neurons that regulate the transport of ions across the membrane.
During the resting state of a neuron, the Na ion channels are completely closed and hence the axonal membrane is nearly impermeable to Na ions.
However, K ion channels with high basal activation are present on the axonal membrane that help in maintaining negative membrane potential.
Therefore, when a neuron is in resting state, the axonal membrane is comparatively more permeable of K ions and nearly impermeable to Na ions.