What is the first layer of the diffusion membrane made of?

What is the first layer of the diffusion membrane made of?
  1. Basement substance
  2. Endothelium of alveolar capillaries
  3. Thin squamous epithelium of alveoli
  4. None of the above

Solution

The diffusion membrane is made up of three major layers, the first of which is the thin squamous epithelium of alveoli.

Asked in: NCERT

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