Biology for IGCSE & O level - Gas Exchange In Humans (Section 2 - No. 9)
Which of the following is a function of the cilia lining the respiratory tract?
To absorb oxygen.
To trap pathogens.
To produce surfactant.
To move mucus and trapped particles.
Explanation
Cilia beat rhythmically to sweep mucus and trapped particles away from the lungs, preventing infection.
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