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In alveoli, the diffusion membrane is made up of
Option: 1
Thin squamous epithelium of alveoli
Option: 2
Endothelium of alveolar capillaries
Option: 3
Basement substance
Option: 4
All of the above
Answers (1)
The diffusion membrane is made up of three major layers:
- Thin squamous epithelium of alveoli
- Endothelium of alveolar capillaries
- Basement substance (composed of a thin basement membrane supporting the squamous epithelium and the basement membrane surrounding the single layer endothelial cells of capillaries) in between them
- Hence the correct option is 4.
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