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When you breathe in what happens to the trachea?
1.the trachea constricts
2.the trachea widens and lengthens
3.the trachea widens and shortens
4.the trachea narrows and lenghtens
Moist, smooth tissue called mucosa lines the inside of the trachea. The trachea widens and lengthens slightly with each breath in, returning to its resting size with each breath out.
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