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Breathing and Exchange of Gases — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYBreathing and Exchange of Gases1 Mark
MCQ
The function of tracheal hair is to:
  • A
    Pass mucus out
  • B
    Pass mucus in
  • C
    Pass air out
  • D
    Pass air in
✓

Answer

  1. Pass mucus out

Explanation:

The innermost layer of trachea consists of ciliated pseudostratified columnar epithelium cells. On the surface of the columnar cells, long, hair-like cilia beat together to push mucus away from the lungs. It is expelled out during coughing.

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