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The figure given below shows a small par...

The figure given below shows a small part of human lung where exchange of gas take, place. In which are of the options given below, the one part A, B, C and D is correctly, identified along with its function?

A

B: Red blood cell - transport of `CO_2` mainly

B

C: Arterial capillary - passes oxygen to tissues

C

A: alveolar cavity - main site of exchange of respiratory gases

D

D: Capillary wall - exchange of `O_2` and `CO_2` takes place here

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