When a neuron is not conducting any impulse i.e. resting , the axonal membrance is

Options

A. Comparatively more permeable to `K^+` and impermeable (nearly impermeable) to `Na^+`
B. Impermeable to negatively charged proteins present in the axoplasm
C. (A) & (B) Both
D. More permeable to `Na^+` ions than `K^+` ion

Answer

**Step-by-Step Solution:**

1. **Understanding Resting State of Neuron:**
- A neuron at rest is in a state where it is not conducting any electrical impulses. This is referred to as the resting membrane potential.

2. **Ion Permeability of the Axonal Membrane:**
- The axonal membrane during the resting state is characterized by its permeability to different ions. Specifically, it is more permeable to potassium ions (K⁺) and less permeable to sodium ions (Na⁺).

3. **Potassium Ion Channels:**
- Potassium channels remain open during the resting state. These channels are often referred to as "lazy channels" because they take longer to close compared to sodium channels.

4. **Sodium Ion Channels:**
- Sodium channels, on the other hand, are nearly impermeable during the resting state. They close quickly after an impulse has passed, preventing sodium ions from entering the neuron.

5. **Concentration Gradient:**
- At rest, there is a higher concentration of potassium ions inside the neuron and a higher concentration of sodium ions outside. This difference in concentration is crucial for the generation of action potentials when the neuron becomes active.

6. **Conclusion:**
- Therefore, the correct description of the axonal membrane during the resting state is that it is comparatively more permeable to potassium ions and nearly impermeable to sodium ions.

**Final Answer:**
The axonal membrane is comparatively more permeable for potassium ions (K⁺) and nearly impermeable for sodium ions (Na⁺).

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