In humans, respiratory membrane is made of

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squamous epithelium of alveoli, basement membrane, and cuboidal epithelium of blood vessels

columnar epithelium of alveoli, basement membrane, and squamous epithelium of blood vessels

squamous epithelium of alveoli, basement membrane, and endothelium of blood vessels

squamous epithelium of alveoli and cuboidal epithelium of blood vessels

answer is C.

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Detailed Solution

The diffusion membrane or the respiratory 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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