MHT CET 202622 AprilMorning Shift
- Exam
- MHT CET
- Year
- 2026
- Date
- 22 April
- Shift
- Morning Shift
- Subject
- Biology
- Chapter
- Breathing and Exchange of Gases
MHT CET 2026 · 22 April · Morning Shift · Biology · Breathing and Exchange of Gases
In the lungs, the alveolar air is separated from blood by ______.
In the lungs, the alveolar air is separated from blood by ______.
Options
- Aa layer of squamous epithelium and smooth muscles.
- Ba layer of squamous epithelium and a layer of transitional epithelium
- Ctwo layers of simple squamous epithelium
- Dtwo layers of tunica externa, interna and tunica media
Correct answer
C. two layers of simple squamous epithelium
Step-by-step solution
The diffusion membrane in the lungs is composed of three major layers: the thin squamous epithelium of alveoli, the endothelium of alveolar capillaries, and the basement substance in between them.
The endothelium of the alveolar capillaries is also a type of simple squamous epithelium.
Therefore, the alveolar air is separated from the blood by two layers of simple squamous epithelium.
Answer: two layers of simple squamous epithelium
The endothelium of the alveolar capillaries is also a type of simple squamous epithelium.
Therefore, the alveolar air is separated from the blood by two layers of simple squamous epithelium.
Answer: two layers of simple squamous epithelium