Biology - Breathing and Exchange of Gases Question with Solution | TestHub
BiologyBreathing and Exchange of GasesHuman Respiratory SystemEasy2 minPYQ_2026
BiologyEasysingle choice
In the lungs, the alveolar air is separated from blood by ______.
Options:
Answer:
C
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
Stream:MHT_CET_MEDICALSubject:BiologyTopic:Breathing and Exchange of GasesSubtopic:Human Respiratory System
⏱ 2mℹ️ Source: PYQ_2026
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