What is the role of cilia in the respiratory tract?

Question

What is the role of cilia in the respiratory tract? — Exam MCQ

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B. Cilia sweep mucus from the lungs and airway towards the nose. — Cilia move mucus and trapped particles along the airways toward the throat for removal. The source describes this as movement towards the nose.

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A. They help to mix all the gases in the inhaled and exhaled air.

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C. Cilia cells produce secretions to trap bacteria and viruses.

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D. Dust particles in the inhaled air stick to the cilia.

What is the role of cilia in the respiratory tract?

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