The figure given below shows a small part of human
lung where exchange of gases takes place. Select the
option which represents labelled part (A, B, C or D)
correctly identified along with its function.
(a) C : Arterial capillary - Passes oxygen to tissues
(b) A : Alveolar cavity - Main site of exchange of
respiratory gases
(c) D : Capillary wall - Exchange of O2 and CO2
takes place here
(d) B : Red blood cells - Transport of CO2 mainly
lung where exchange of gases takes place. Select the
option which represents labelled part (A, B, C or D)
correctly identified along with its function.
(a) C : Arterial capillary - Passes oxygen to tissues
(b) A : Alveolar cavity - Main site of exchange of
respiratory gases
(c) D : Capillary wall - Exchange of O2 and CO2
takes place here
(d) B : Red blood cells - Transport of CO2 mainly