Which of the following statement is not correct exciting stage of neuron’?

Options

A. (1) Generation of action potential
B. (2) More permeability of `Na^+` comparatively `K^+`
C. (3) Depolarisation of axonal membrane
D. (4) More negative charge inside

Answer

To determine which statement is not correct regarding the exciting stage of a neuron, we need to analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding the Exciting Stage of a Neuron**:
- The exciting stage of a neuron is also known as the depolarization stage. During this phase, the neuron's membrane potential changes, leading to the generation of an action potential.

2. **Analyzing Each Statement**:
- **Statement 1**: "Generation of action potential"
- This statement is correct. During the exciting stage, an action potential is generated due to the depolarization of the membrane.

- **Statement 2**: "More permeability of sodium ion comparatively potassium ion"
- This statement is also correct. During depolarization, the neuronal membrane becomes more permeable to sodium ions than to potassium ions, allowing sodium to enter the cell.

- **Statement 3**: "Depolarization of axonal membrane"
- This statement is correct as well. The axonal membrane undergoes depolarization during the exciting stage, which is a key characteristic of this phase.

- **Statement 4**: "More negative charge inside"
- This statement is incorrect. During the exciting stage, the inside of the neuron becomes more positively charged due to the influx of sodium ions, not more negative.

3. **Conclusion**:
- The statement that is not correct regarding the exciting stage of a neuron is the fourth one: "More negative charge inside".

### Final Answer:
The statement that is not correct is: **"More negative charge inside."**