The diffusion membrane is made up of:

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(D) The diffusion membrane is composed of three major layers:$(i)$ The thin squamous epithelium of the alveoli.$(ii)$ The endothelium of the alveolar

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All of the above

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(D) The diffusion membrane is composed of three major layers:$(i)$ The thin squamous epithelium of the alveoli.$(ii)$ The endothelium of the alveolar capillaries.$(iii)$ The basement substance (basement membrane) located between the squamous epithelium of the alveoli and the endothelium of the alveolar capillaries.Therefore,all the mentioned components contribute to the structure of the diffusion membrane.

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