Question

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 or D is correctly identified along with its function?

• 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 $O_2$ takes place here only

Answer 1

The correct option is C A: Alveolar cavity - Main site of exchange of respiratory gases


A is alveolar cavity. Alveolar cavity is a hollow cup shaped structure found in lungs. It is the main site for gaseous exchange.