Repolarisation of Neuron is occured due to :

Options

A. Influx of `Na^+`
B. Influx of `K^+`
C. Efflux of `Na^+`
D. Efflux of `K^+`

Answer

**Step-by-Step Solution:**

1. **Understanding Neuron Action Potential:**
- Neurons communicate through electrical signals known as action potentials. An action potential consists of depolarization followed by repolarization.

2. **Depolarization Phase:**
- During depolarization, sodium (Na+) channels open, allowing sodium ions to flow into the neuron. This influx of sodium ions causes the inside of the neuron to become more positive relative to the outside.

3. **Repolarization Phase:**
- After the peak of the action potential, the neuron needs to return to its resting state. This process is known as repolarization.

4. **Role of Potassium in Repolarization:**
- Repolarization occurs when potassium (K+) channels open. This allows potassium ions to flow out of the neuron, which is referred to as the efflux of potassium.

5. **Change in Polarity:**
- The efflux of potassium ions helps restore the negative charge inside the neuron, thereby changing the polarity back to its resting state.

6. **Conclusion:**
- The repolarization of a neuron occurs due to the efflux of potassium ions, which is the correct answer.

**Final Answer:**
- Repolarization of the neuron occurs due to the efflux of potassium ions.

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