The motive power for this upside-down stream is, of course, the cilia of the ciliated mucous membrane ... in a given time, in the trachea is many times greater than that in a similar unit area ...

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Cilia are small hairs which beat to push the mucus back up the trachea so it can be swallowed and destroyed in the stomach. Clean air then enters the two bronchi, one bronchus going to each lung.