NEET 2011 · Class 11

Neural Control and Coordination

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

  1. (A)comparatively more permeable to Na+ ions and nearly impermeable to K+ ions
  2. (B)equally permeable to both Na+ and K+ ions
  3. (C)impermeable to both Na+ and K+ ions
  4. (D)comparatively more permeable to K+ ions and nearly impermeable to Na+ ions

The NCERT line that answers it

Verbatim line

When a neuron is not conducting any impulse, i.e., resting, the axonal membrane is comparatively more permeable to potassium ions ( $K^+$ ) and nearly impermeable to sodium ions ( $Na^+$ ).

Chapter
Neural Control and Coordination
Section
18.3.1 Generation and Conduction of Nerve Impulse
Page
2
Words matched
28 of 28

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states 'the axonal membrane is comparatively more permeable to potassium ions (K⁺) and nearly impermeable to sodium ions (Na⁺)', which directly matches option D and distinguishes it from all other options.

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