Wall of alveoli is composed of

Options

A. Simple squamous epithelium
B. Simple cuboidalepithelium
C. Pseudostratified epithelium
D. Simple columnar epithelium

Answer

**Step-by-Step Solution:**

1. **Understanding Alveoli**: Alveoli are tiny air sacs located in the lungs, and they play a crucial role in the respiratory system by facilitating the exchange of gases (oxygen and carbon dioxide) between the air and the bloodstream.

2. **Composition of Alveolar Walls**: The walls of the alveoli are lined with epithelial cells. These cells are essential for the process of gas exchange, as they need to be thin to allow for efficient diffusion of gases.

3. **Types of Epithelial Tissue**: The question provides four options for the type of epithelial tissue that makes up the alveolar walls:
- Simple squamous epithelium
- Simple cuboidal epithelium
- Pseudostratified epithelium
- Simple columnar epithelium

4. **Identifying the Correct Type**: Among these options, simple squamous epithelium is the correct type. This type of epithelium consists of a single layer of flat cells, which is ideal for diffusion due to its thinness.

5. **Conclusion**: Therefore, the wall of the alveoli is composed of simple squamous epithelium. The other types of epithelium listed (simple cuboidal, pseudostratified, and simple columnar) are not found in the walls of the alveoli.

**Final Answer**: The wall of alveoli is composed of **simple squamous epithelium**.

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