The air we breathe in is warmed, moistened and filtered of dust mainly in the
- A. nasal cavity
- B. trachea only
- C. bronchi
- D. alveoli
Explanation
Hairs and mucus trap particles while blood vessels warm the air and secretions humidify it before it reaches delicate lung tissue. Mouth breathing bypasses this conditioning, which is why it dries the throat.
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