What is true about regulation of respiration -

Options

A. Respiratory rhythm centre lie on pons region.
B. The role of oxygen in the regulation of respiratory rhythm is quite insignificant.
C. Chemosensitive area of brain can recognise changes in `O_(2)`
D. Neural signal from pneumotaxic centre can not change the duration of inspiration.

Answer

To answer the question about the regulation of respiration, we will analyze each statement provided in the options and determine which one is true.

### Step-by-Step Solution:

1. **Evaluate the First Statement**:
- **Statement**: "Respiratory rhythm center lies on pons region."
- **Analysis**: This statement is incorrect. The respiratory rhythm center is primarily located in the medulla oblongata, not the pons. The medulla is responsible for generating rhythmic nerve impulses that control breathing.

2. **Evaluate the Second Statement**:
- **Statement**: "The role of oxygen in the regulation of the respiratory rhythm is quite insignificant."
- **Analysis**: This statement is correct. While oxygen levels do influence respiration, they are not the primary regulators. The body primarily responds to changes in carbon dioxide levels and pH, making the role of oxygen relatively insignificant in the immediate regulation of the respiratory rhythm.

3. **Evaluate the Third Statement**:
- **Statement**: "Chemosensitive area of the brain can recognize changes in oxygen."
- **Analysis**: This statement is incorrect. The chemosensitive area of the brain is primarily sensitive to changes in carbon dioxide levels and hydrogen ion concentration, rather than oxygen levels. While oxygen levels can affect respiration, they are not the primary trigger.

4. **Evaluate the Fourth Statement**:
- **Statement**: "Neural signal from pneumotoxic center cannot change the duration of inspiration."
- **Analysis**: This statement is also incorrect. The pneumotoxic center is involved in regulating the duration of inspiration, and it can decrease the duration of inhalation, thus affecting the breathing process.

5. **Conclusion**:
- The only true statement regarding the regulation of respiration is the second one: "The role of oxygen in the regulation of the respiratory rhythm is quite insignificant."

### Final Answer:
The correct statement about the regulation of respiration is: **The role of oxygen in the regulation of respiratory rhythm is quite insignificant.**

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