Breathing and Exchange of Gases — BIOLOGY STD 11 Science — Question
Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYBreathing and Exchange of Gases1 Mark
MCQ
Cilia of trachea transfers:
✓
Mucous into pharynx
B
Mucous into lungs
C
Air into lungs
D
Air into pharynx
✓
Answer
Correct option: A.
Mucous into pharynx
The thin film of mucus accumulated in the oral cavity is cleared by coordinated movement of cilia in the direction towards the pharynx. Thereby, the viscous film of mucus is transported off in the direction towards the mouth, where it is either swallowed or expelled via coughing.
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