Which of the following diagram illustrates the distribution of $N a^{+}$ and $K^{+}$ ions in a section of non-myelinated axon which is at resting potential?

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Solution

The correct option is A
When a neuron is at resting potential, i.e., not conducting any impulse the axonal membrane is comparatively more permeable to K+ ions and nearly impermeable to Na+ ions.

Consequently the axoplasm inside the axon contains high concentration of K+ ions. In contrast, the fluid outside the axon has a high concentration of Na+ ions and thus forms a concentration gradient.

Thus, the correct answer is "option A"

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Potential difference across resting membrane is negatively charged. This is due to differential distribution of the following ions.

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