NEETZoologyBreathing and Exchange of Gases
What is the total thickness combining the three layers?
Options
- AA millimetre
- BJust more than a millimetre
- CLess than a millimetre
- DMore than 2 millimetres
Correct answer
C. Less than a millimetre
Step-by-step solution
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.