Biology for IGCSE & O level - Gas Exchange In Humans (Section 4 - No. 16)
What is the function of cilia in the respiratory system?
To facilitate gas exchange in the alveoli
To trap and remove dust particles and pathogens
To produce mucus
To increase the surface area of the lungs
Explanation
Cilia are tiny hair-like structures that help to sweep mucus and trapped particles out of the respiratory tract.
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