Lungs are spongy due to the presence of million of___________?
Correct answer: B. Alveoli
- A. Air sacs
- B. Alveoli
- C. Bronchioles
- D. Parabronchi
Explanation
The lungs are spongy because they contain millions of alveoli, tiny air sacs surrounded by capillaries that provide a large surface area for gas exchange. Students may choose bronchioles because they branch extensively inside the lungs, but bronchioles are air passages and do not provide the main exchange surface.
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