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The mucociliary escalator is the nonimmunological defense mechanism involving ciliary action and flow of mucus from bronchioles, through the bronchi and trachea to the larynx, by which particulate matter is removed from the respiratory tract. Called also mucociliary ladder.

This movement up the respiratory tract removes dust, tiny bugs, pollen and other unwelcome visitors up and out. Sometimes you will sneeze it out and other times you will swallow it and the very acid juices in the stomach will take care of it.

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