Why is it advantageous that the shape of the trachea changes when you swallow a large mouthful of food?

Why is it advantageous that the shape of the trachea changes when you swallow a large mouthful of food?
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It is important that food not go down the trachea, or expand theesophagus into the trachea or larynx. The epiglottis blocks thetrachea when swallowing, and the change in shape makes this moreeffective.
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