(B) The diffusion membrane is composed of three major layers: $1$. The thin squamous epithelium of the alveoli. $2$. The endothelium of the alveolar c

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Thin squamous epithelium of alveoli,endothelium of alveolar capillaries and the basement substance

(B) The diffusion membrane is composed of three major layers: $1$. The thin squamous epithelium of the alveoli. $2$. The endothelium of the alveolar capillaries. $3$. The basement substance (basement membrane) in between them. These layers facilitate the exchange of $O_2$ and $CO_2$ by diffusion due to their extremely thin nature.

Class 11 Biology Breathing and Exchange of Gases Exchange of gases

Medium

Which are the three main layers that form the diffusion membrane?

A
Thin squamous epithelium of alveoli,basement membrane of bronchioles and basement substance
B
Thin squamous epithelium of alveoli,endothelium of alveolar capillaries and the basement substance
C
Basement substance,cuboidal epithelium of alveoli and stratified epithelium of bronchiole
D
Ciliated epithelium of trachea,endothelium of capillaries and basement substance