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STD 11 - 14. Breathing and exchange in gases — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 14. Breathing and exchange in gases1 Mark
MCQ
Which are the three main layers that form the diffusion membrane?
  • A
    Thin squamous epithelium of alveoli, basement membrane of bronchioles and basement substance
  • ✓
    Thin squamous epithelium of alveoli, endothelium of alveolar capillaries and the basement substance
  • C
    Basement substance, cuboidal epithelium of alveoli and stratified epithelium of bronchiole
  • D
    Ciliated epithelium of trachea, endothelium of capillaries and basement substance
✓

Answer

Correct option: B.
Thin squamous epithelium of alveoli, endothelium of alveolar capillaries and the basement substance
b
Diffusion of $O_2$ and $CO_2$ depends on the thickness of diffusion membrane.

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