Question

21. 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 o Dis correctly identified along with its function? 1) B - Red blood cell-transport of CO mainly 2) C - Arterial capillan - passes oxygen to tissues 3) A - Alveolar cavity - main site of exchange of respiratory gases 4) D-Capillary wall-exchange of O2 and CO2 takes place here respire in total absence of air?​

Answer 1

Answer:

'A'→ Alveolar cavity- main site of exchange of respiratory gases.