Tiny hairlike projections called cilia, which carpet the membrane sweep the material away from the surface. With rapid, forceful strokes, the cilia push the mucus and debris out of the passage at the rate of about an inch a minute.
This escalator of cilia removes nearly all foreign material to a part of the throat near the mouth called the oropharynx, where it can be coughed out, old swallowed and eventually eliminated from the digestive tract with other wastes.
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