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What causes mucus to be moved out of the sinuses?

causes Moved mucus sinuses
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What causes mucus to be moved out of the sinuses?

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There are tiny hairs in the sinuses called cilia. They beat like waves and move mucus out of the sinuses through a tiny hole (actually a short tube). The tube forms a hairpin turn and is only about 1/6 of an inch in diameter. Obviously it is very easy for this to get blocked.

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