Read the following.
(a) Squamous epithelium of alveoli
(b) Endothelium of alveolar capillaries
(c) Basement substance
In the above, the diffusion membrane is formed by

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a and c only

a and b only

a, b and c

b and c only

answer is D.

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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 in between them.

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