A) B: red blood cell-transport of \[C{{O}_{2}}\]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 \[C{{O}_{2}}\]takes place here
Correct Answer: C
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