Emphysema is a condition in which

Options

A. Repiratoy centre inhibited
B. Lot of fluid in the lungs
C. The walls seperating the alveoli break
D. Lungs have more `O_(2)`

Answer

### Step-by-Step Solution:

1. **Understanding Emphysema**: Emphysema is a chronic lung condition that is classified as a type of Chronic Obstructive Pulmonary Disease (COPD). It primarily affects the alveoli, which are the tiny air sacs in the lungs responsible for gas exchange.

2. **Identifying the Damage**: In emphysema, the walls of the alveoli become damaged and lose their elasticity. This damage leads to the enlargement of the air spaces and reduces the surface area available for gas exchange.

3. **Analyzing the Options**:
- **Option 1: Respiratory Center Inhibited**: This option is incorrect. The respiratory center in the brain (medulla and pons) does not get inhibited in emphysema.
- **Option 2: Lots of fluid in the lungs**: This option is also incorrect. Emphysema is not characterized by fluid accumulation in the lungs.
- **Option 3: The wall separating the alveoli breaks down**: This option is correct. In emphysema, the walls of the alveoli are damaged, leading to the breakdown of these structures.
- **Option 4: Lungs have more oxygen**: This option is incorrect. In emphysema, the ability to exchange gases is impaired, which does not lead to an increase in oxygen levels in the lungs.

4. **Conclusion**: Based on the analysis of the options, the correct answer is that in emphysema, "the wall separating the alveoli breaks down."