In humans, respiratory membrane is made of

Moderate

A

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

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

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

squamous epithelium of alveoli and cuboidal epithelium of blood vessels

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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