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490

Q:

The upper part of the respiratory tract is provided with small hair-like structures called ______.

  • 1
    bronchi
  • 2
    cilia
  • 3
    villi
  • 4
    alveoli
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Answer : 2. "cilia"
Explanation :

Hairlike structures called cilia line the mucous membrane and move the particles trapped in the mucus out of the nose. Inhaled air is moistened, warmed, and cleansed by the tissue that lines the nasal cavity.


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