First slide
Exchange of Gases
Question

The respiratory (diffusion membrane) across which exchange of gases occurs in the lungs consists of all the following, except

Easy
Solution

The diffusion membrane is made up of three major layers:
1. the thin squamous epithelium of alveoli
2. the endothelium of alveolar capillaries
3. the basement substance
The basement substance is 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.

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