What is the primary respiratory role of air sacs in birds?
Correct answer: B. They ventilate the lungs by moving air
- A. They directly exchange oxygen with blood
- B. They ventilate the lungs by moving air
- C. They filter dust from inhaled air
- D. They produce surfactant for the lungs
Explanation
Air sacs act as bellows that maintain a largely one-way flow of air through the parabronchi. They have little direct role in gas exchange, so option A confuses ventilation with the exchange surface.
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