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  4. The figure given below shows a small part of human lung where exchange of gases takes place. In which one of the options given below, the one part A, B, C or D is correctly identified along with its function? ​ <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/b-uvsuu0dmhorhzzb2.jpg />

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Q. The figure given below shows a small part of human lung where exchange of gases takes place. In which one of the options given below, the one part A, B, C or D is correctly identified along with its function?
​ Question

NTA AbhyasNTA Abhyas 2022

Solution:

In the given figure the exchange of respiratory gases occurs in alveolar cavity.
The diffusion membrane is made up of three major layers 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. Therefore, all the factors in our body are favourable for diffusion of O2 from alveoli to tissues and that of CO2 from tissues to alveoli.