Where is the centre of regulation of respiration?

Answer

### Step-by-Step Solution:

1. **Understanding Respiration**: Respiration is the process by which the body exchanges gases with the environment. It involves taking in oxygen and expelling carbon dioxide.

2. **Role of Lungs**: The lungs are the primary organs involved in respiration. They expand and contract to facilitate the intake of oxygen and the release of carbon dioxide.

3. **Gas Exchange Process**: Oxygen taken in by the lungs is mixed with the blood in the circulatory system, which then transports it to various tissues and organs in the body.

4. **Regulation of Respiration**: The regulation of respiration is primarily controlled by the nervous system, which serves as the control center for bodily functions.

5. **Medulla Oblongata**: Within the nervous system, the medulla oblongata is specifically identified as the respiratory center. It plays a crucial role in controlling the rate and depth of breathing.

6. **Mechanism of Control**: The medulla oblongata sends signals to the respiratory muscles, instructing them to contract and relax. This action adjusts the breathing rate based on the body's oxygen needs and carbon dioxide levels.

7. **Conclusion**: Therefore, the center of regulation of respiration is located in the medulla oblongata of the brain.