Which structure is the main site of gas exchange in the avian lung?
Correct answer: C. Parabronchi
- A. Pulmonary alveoli
- B. Air sacs
- C. Parabronchi
- D. Syrinx
Explanation
Gas exchange in birds occurs mainly through the parabronchi and their associated air capillaries. Air sacs act as bellows for ventilation but are not the principal sites of oxygen and carbon dioxide exchange.
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