Gaseous exchange in birds occurs at level of_______________?
Correct answer: D. Parabronchi
- A. Alveoli
- B. Air sacs
- C. Bronchi
- D. Parabronchi
Explanation
Birds exchange gases across the thin walls of parabronchi, where air flows continuously through tubes surrounded by capillaries. Air sacs act mainly as bellows for ventilation and are not the principal exchange surface, so b is the common mistake.
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