question_answer

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 and takes place here

D)  b : Red blood cells - carry out transport of