NEETZoologyBreathing and Exchange of Gases
What is A, B and C in the following diagram?
Options
- ABasement membrane, Squamous Epithelium, Endothelium
- BEndothelium, Squamous Epithelium, Basement membrane
- CBasement membrane, Endothelium, Squamous Epithelium
- DNone of the above
Correct answer
D. None of the above
Step-by-step solution
A is Squamous Epithelium, B is Basement membrane, C is Endothelium. The diffusion membrane is made up of three major layers (Figure 17.4) namely, the thin squamous epithelium of alveoli, the endothelium of alveolar capillaries and the basement substance in between them. However, its total thickness is much less than a millimetre.