The presence  of  epiglottis  prevents  the  food  from  entering  the  trachea

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There is a flap-like epiglottis attached at the entrance of larynx. It has a leaf like shape.  It normally points upwards wen we breath. When we swallow food, epiglottis folds down to a horizontal position, so preventing food going to trachea. food is directed to esophagus.
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