The figure given below shows a small part of human lung where exchange of gas takes place. [AIPMT (S) 2011] In which one of the options given below, the one part A, B C or D is correctly identified along with its function.  |
A) A Alveolar cavity main site of exchange of respiratory gases
B) D Capillary wall exchange of and takes place here
C) B Red blood cell transport of mainly
D) C Arterial capillary ' passes oxygen to tissues
Correct Answer: A
Solution :
| [A] Alveoli are the primary sites of exchange of gases. The exchange of gases (\[{{O}_{2}}\] and \[C{{O}_{2}}\]) between the alveoli and the blood occurs by simple diffusion. |
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