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GK QUESTION#3801

Which structures in the upper respiratory tract help filter out dust, germs, and other harmful particles from the air we breathe?

  1. AAlveoli
  2. BBronchioles
  3. CLungs
  4. DCiliaCorrect answer
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Answer

D. Cilia

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Explanation

Cilia in the conducting airways move mucus and trapped particles toward the throat. Mucus traps particles; coordinated ciliary movement transports the mucus.

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