Question

In a resting neuron, the axon membrane is

• A. comparatively more permeable to $K^{+}$ and nearly impermeable to ${\mathrm{Na}}^{+}$ ions
• B. comparatively more permeable to ${\mathrm{Na}}^{+}$ and nearly impermeable to $K^{+}$ ion
• C. impermeable to both ${\mathrm{Na}}^{+}$ and $K^{+}$ ions
• D. equally permeable to both ${\mathrm{Na}}^{+}$ and $K^{+}$ ions

Answer 1

The correct option is A comparatively more permeable to $K^{+}$ and nearly impermeable to ${\mathrm{Na}}^{+}$ ions

When a neuron is at a resting phase i.e., it is not conducting any impulse, the axonal membrane is comparatively more permeable to potassium ions (K+) and impermeable to sodium ions (Na+) and to negatively charged proteins present in the axoplasm.