Question:
Alveolar wall is made up of ------- epithelium resting on a basement membrane of connective tissue.
Alveolar wall is made up of ------- epithelium resting on a basement membrane of connective tissue.
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Gas exchange needs a very thin barrier, so the alveolar wall has thin flat squamous cells.
Updated On: Nov 12, 2026
- Ciliated
- Squamous
- Columnar
- Cuboidal
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Oxygen and carbon dioxide are exchanged between alveolar air and blood by simple diffusion.
Step 2: Structure needed
Diffusion is fastest across the thinnest possible barrier, so the wall is a single layer of thin, flat cells.
Step 3: Type of epithelium
This is simple squamous epithelium resting on a thin basement membrane.
Final Answer:
The alveolar wall is made of squamous epithelium. \[ \boxed{\text{(B) }\text{Squamous}} \]
Oxygen and carbon dioxide are exchanged between alveolar air and blood by simple diffusion.
Step 2: Structure needed
Diffusion is fastest across the thinnest possible barrier, so the wall is a single layer of thin, flat cells.
Step 3: Type of epithelium
This is simple squamous epithelium resting on a thin basement membrane.
Final Answer:
The alveolar wall is made of squamous epithelium. \[ \boxed{\text{(B) }\text{Squamous}} \]
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