Large dust particles are trapped by the hair and mucus in the:
Correct answer: A. Nostrils
- A. Nostrils
- B. Pharynx
- C. Nasal cavities
- D. Nose
Explanation
Nose has two openings called nostrils. Nostrils have fine hair to trap dust particles present in the air and stops them from entering our respiratory system.
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About Respiration
The human respiratory system includes the air passages, lungs, alveoli and breathing muscles, while gaseous exchange explains how oxygen enters blood and carbon dioxide leaves it by diffusion. The effects of smoking include damage to cilia and alveoli, reduced gas exchange, chronic bronchitis, emphysema and increased risk of lung cancer.
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