Which of the following reflex is involved to prevent
excessive inflation of the lungs?

Options

A. Stretch reflex
B. Hering- Breuer's reflex
C. Withdrawal reflex
D. Conditioned reflex

Answer

To determine which reflex is involved in preventing excessive inflation of the lungs, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Lung Inflation**:
- The lungs can become overly inflated during breathing, especially during deep inhalation. This can be harmful if not regulated.

2. **Identifying Reflexes**:
- We need to consider the reflexes listed: stretch reflex, Herring-Breuer reflex, withdrawal reflex, and coordination reflex.

3. **Herring-Breuer Reflex**:
- The Herring-Breuer reflex is specifically known for its role in regulating lung inflation. It is named after scientists Joseph Herring and Edward Breuer.

4. **Mechanism of the Herring-Breuer Reflex**:
- This reflex involves stretch receptors located in the walls of the bronchi and bronchioles. When the lungs inflate excessively, these receptors are activated.

5. **Response to Stretching**:
- Upon activation, the stretch receptors send signals to the nervous system, which in turn inhibits further inhalation. This prevents the lungs from over-inflating.

6. **Conclusion**:
- Therefore, the reflex that prevents excessive inflation of the lungs is the Herring-Breuer reflex.

### Final Answer:
The reflex involved in preventing excessive inflation of the lungs is the **Herring-Breuer reflex**.

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