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

1. comparatively more permeable to Na+ ions and nearly impermeable to K+ ions
2. equally permeable to both Na+ and K+ ions
3. impermeable to both Na+ and K+ ions
4. comparatively more permeable to K+ ions and nearly impermeable to Na+ ions

Correct answer: comparatively more permeable to K+ ions and nearly impermeable to Na+ ions

Solution

In a resting neuron, many K+ leak channels are open, so K+ crosses the axonal membrane much more readily than Na+. Na+ permeability is very low, which helps maintain the resting membrane potential.

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