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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About Gaseous Exchange in Lungs
Gaseous exchange in the lungs occurs across the thin, moist alveolar and capillary surfaces, where oxygen and carbon dioxide diffuse down partial pressure gradients. The topic covers alveolar adaptations, ventilation, the role of haemoglobin in oxygen transport, carbon dioxide carriage, and the difference between external gas exchange and cellular respiration.
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