NEET2011ZoologyBreathing and Exchange of GasesActual
The figure given below shows a small part of human lung where exchange of gas 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.
Options
- AA - Alveolar cavity - main site of exchange of respiratory gases
- BD - Capillary wall - exchange of and takes place here
- CB - Red blood cell - transport of mainly
- DC - Arterial capillary - passes oxygen to tissues
Correct answer
A. A - Alveolar cavity - main site of exchange of respiratory gases
Step-by-step solution
Alveoli are the primary sites of exchange of gases. The exchange of gases ( O ₂ . and . CO ₂ ) between the alveoli and the blood occurs by simple diffusion.