The figure given below shows a small part of human lung where exchange of gases takes place. In which one of the option given below, the one part A, B, C or D is correctly identified along with its functions A. B : Red blood cell - transport of `CO_(2)` mainlyB. C : Arterial capillary - passes oxygen to tissuesC. A : alveolar cavity - main site of exchange of respiratory gasesD. D : Capillary wall - exchange of `O_(2) " and " CO_(2)` takes place here

The figure given below shows a small part of human lung where exchange

1.	The figure given below shows a small part of human lung where exchange of gases takes place. In which one of the option given below, the one part A, B, C or D is correctly identified along with its functions A. B : Red blood cell - transport of `CO_(2)` mainlyB. C : Arterial capillary - passes oxygen to tissuesC. A : alveolar cavity - main site of exchange of respiratory gasesD. D : Capillary wall - exchange of `O_(2) " and " CO_(2)` takes place here
Answer» Correct Answer - c A is the alveolar cavity which is the main site of exchange of respiratory gases.