How many layers are present in the diffusion | vedclass

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(B) The diffusion membrane is composed of three major layers: the thin squamous epithelium of the alveoli,the endothelium of the alveolar capillaries,

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(B) The diffusion membrane is composed of three major layers: the thin squamous epithelium of the alveoli,the endothelium of the alveolar capillaries,and the basement membrane (basement substance) located between them.These three layers facilitate the efficient exchange of gases.Despite having three layers,the total thickness of the diffusion membrane is much less than a millimeter,which is highly favorable for the diffusion of $O_{2}$ from the alveoli to the tissues and $CO_{2}$ from the tissues to the alveoli.

How many layers are present in the diffusion membrane of the alveolus capillary?

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