When a neuron is an resting state, i e, not… - NEET UG 2011 Zoology PYQ

NEET UG 2011 — Zoology Neural Control and Coordination

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When a neuron is an resting state, $i e$ , not conducting any impulse, the axonal membrane is

Official previous-year question

Held on 30 Apr 2011 · Verified 9 Jul 2026.

Options

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

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Solution

Neurons are excitable cells because their membrane are in a polarised state. Different types of selectively permeable channels are present on the neural membrane. When a neuron is not conducting any impulse, ie, resting, the axonal membrane is comparatively more permeable to potassium ion $\left(\mathrm{K}^{+}\right)$ and nearly impermeable to sodium ion $\left(\mathrm{Na}^{+}\right)$ .

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