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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? [2011]
Options:
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- C: arterial capillary – passes oxygen to tissues
- A: alveolar cavity – main site of exchange of respiratory gases
- D: capillary wall – exchange of O2 and CO2 takes place here.
- B: red blood cell – transport of CO2 mainly
Correct Option: B
In the given figure the exchange of respiratory gases occurs in alveolar cavity.
