What system are the trachea, bronchi or bronchioles, air sac, and diaphragm in?
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they all are in human´s respiratory system
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The bronchus in the lungs are lined with hair-like projections called cilia that move microbes and debris up and out of the airways. Scattered throughout the cilia are goblet cells that secrete mucus which helps protect the lining of the bronchus and trap microorganisms.
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