Lungs have a large number of alveoli for

Options

A. Having spongy texture and proper shape
B. More surface area for diffusion of gases
C. More space for increasing volume of inspired air
D. More nerve supply

Answer

**Step-by-Step Text Solution:**

1. **Understanding the Structure of Lungs:**
- The lungs are the primary organs responsible for respiration. They contain numerous small air sacs called alveoli.

2. **Role of Alveoli:**
- Alveoli are tiny, balloon-like structures that facilitate gas exchange. They are crucial for the process of breathing, allowing oxygen to enter the bloodstream and carbon dioxide to be expelled.

3. **Surface Area for Gas Exchange:**
- The large number of alveoli in the lungs increases the surface area available for gas exchange. This is essential because a greater surface area allows for more efficient diffusion of gases.

4. **Gas Exchange Mechanism:**
- Gas exchange occurs due to differences in partial pressure. Oxygen moves from areas of higher partial pressure (in the alveoli) to lower partial pressure (in the blood), while carbon dioxide moves in the opposite direction.

5. **Conclusion:**
- Therefore, the primary reason for the large number of alveoli in the lungs is to provide a greater surface area for the diffusion of gases, enhancing the efficiency of respiration.

**Final Answer:**
The lungs have a large number of alveoli to provide more surface area for the diffusion of gases.

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