The specialty common in the alveoli of lungs and villi of intestine in mammals is that both

Options

A. Provides a large surface area
B. Have ciliated epithelium
C. Are suited for diffusion of gases
D. Have rich supply of blood vessel and lymph ducts

Answer

To answer the question about the common specialty of the alveoli in the lungs and the villi in the intestines of mammals, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structures**:
- Alveoli are tiny air sacs in the lungs responsible for gas exchange.
- Villi are finger-like projections in the small intestine that aid in the absorption of nutrients.

2. **Function of Alveoli**:
- Alveoli facilitate the exchange of oxygen and carbon dioxide between the air and the bloodstream.
- They have a very thin wall and a large surface area to maximize the efficiency of gas diffusion.

3. **Function of Villi**:
- Villi increase the surface area of the intestinal lining, which enhances the absorption of digested food and nutrients into the bloodstream.
- Like alveoli, villi also have a large surface area to optimize absorption.

4. **Comparison of Features**:
- Both alveoli and villi have a large surface area, which is essential for their respective functions (gas exchange for alveoli and nutrient absorption for villi).
- They do not share other characteristics like ciliated epithelium or being suited for gas diffusion since villi do not participate in gas exchange.

5. **Conclusion**:
- The common specialty between alveoli and villi is that both provide a large surface area, which is crucial for their functions in the body.

### Final Answer:
The specialty common in the alveoli of lungs and villi of intestine in mammals is that both provide a large surface area.

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