The diffusion membrane is comprised of

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The diffusion membrane is comprised of

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three major layers - squamous epithelium of alveoli, basement substance and endothelium of capillaries.

two layers - squamous epithelium of alveoli and endothelium of capillaries.

two major layers - columnar epithelium of alveoli and endothelium of capillaries.

three major layers - squamous epithelium of alveoli, basement substance and mesothelium of capillaries.

answer is C.

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Detailed Solution

The diffusion membrane is made up of three major layers namely, the thin squamous epithelium of alveoli, the endothelium of alveolar capillaries and the 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.

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