How do goblet cells and ciliated cells together keep the airways clean?
Correct answer A. Goblet cells secrete mucus that traps particles and cilia sweep it towards the pharynx
Explanation
Mucus from goblet cells traps dust and microbes. The beating cilia move this mucus upwards to the pharynx, where it is swallowed or coughed out. This is the mucociliary escalator.
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