Which of the following options illustrates the distribution of `Na^+ and K^+` ions in a section of non-myelinated axon which is at resting potentail ?

Options

A.
B.
C.
D.

Explanation

To solve the question regarding the distribution of `Na^+` and `K^+` ions in a section of a non-myelinated axon at resting potential, we can follow these steps:

### Step 1: Understand Resting Potential
At resting potential, a neuron is not conducting an impulse. This state is characterized by specific ion distributions across the axonal membrane.

**Hint:** Remember that resting potential refers to the state of the neuron when it is not actively transmitting signals.

### Step 2: Ion Permeability
The axonal membrane during resting potential is more permeable to potassium ions (`K^+`) than to sodium ions (`Na^+`). This means that potassium ions can move more freely across the membrane compared to sodium ions.

**Hint:** Focus on the permeability of the axonal membrane to different ions during resting potential.

### Step 3: Concentration Gradients
Inside the axon (exoplasm), there is a high concentration of potassium ions (`K^+`), while outside the axon, there is a high concentration of sodium ions (`Na^+`). This creates a concentration gradient where `K^+` is more concentrated inside and `Na^+` is more concentrated outside.

**Hint:** Think about how the concentration of ions differs inside and outside the axon.

### Step 4: Identify the Correct Option
Given the information about ion distribution, the correct option should show high concentration of `K^+` ions inside the axon and high concentration of `Na^+` ions outside the axon. This matches with option A.

**Hint:** Look for the option that accurately represents the high concentration of `K^+` inside and `Na^+` outside.

### Step 5: Confirm the Answer
Review the other options to ensure they do not match the correct distribution. The other options may incorrectly depict the concentrations of `Na^+` and `K^+`, either showing both low or incorrectly switching their locations.

**Hint:** Eliminate options that do not fit the established ion concentration patterns.

### Conclusion
The correct answer is option A, which illustrates that inside the axon, the concentration of potassium ions (`K^+`) is high, while outside the axon, the concentration of sodium ions (`Na^+`) is high.