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STD 11 - 18. Neural control and coordination — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 18. Neural control and coordination1 Mark
MCQ
The nerve fibre in its resting stage is
  • ✓
    More permeable to $K^{* i i}$
  • B
    Semi-permeable to $K^{+i i}$
  • C
    Less permeable to $K^{* i i}$
  • D
    All of these
✓

Answer

Correct option: A.
More permeable to $K^{* i i}$
a
In resting nerve fibre (a nerve fibre that is not conducting an impulse), sodium ions ( $N a^{* i i}$ ) predominate in the extra cellular fluid, whereas potassium ions $\left(K^{* i i}\right)$ predominate in the intracellular fluid (within the fibre). This result in the fact that, the resting membrane has only a poor permeability for $N a^{* i i}$ although it has a higher permeability for $K^{* i i}$.

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