A) equally permeable to both \[N{{a}^{+}}\] and \[{{K}^{+}}\] ions
B) impermeable to both \[N{{a}^{+}}\] and \[{{K}^{+}}\] ions
C) comparatively more permeable to \[{{K}^{+}}\] ions and nearly impermeable to \[N{{a}^{+}}\] ions
D) comparatively more permeable to \[N{{a}^{+}}\] ions and nearly impermeable to \[{{K}^{+}}\]ions
Correct Answer: C
Solution :
| [C] 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 \[({{K}^{+}})\] and nearly impermeable to sodium ion \[(N{{a}^{+}})\]. |
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