The diffusion membrane is comprised of

Easy

A

three major layers - squamous epithelium of alveoli, basement substance and mesothelium of capillaries.
B

two layers - squamous epithelium of alveoli and endothelium of capillaries.
C

three major layers - squamous epithelium of alveoli, basement substance and endothelium of capillaries.
D

two major layers - columnar epithelium of alveoli and endothelium of capillaries.

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 (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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