The two openings of the pharynx ,one leading to trachea and the other leading to oesophagus ,lie very close to each other . yet the food we swallow normally does not enter into our trachea........can any1 tell me y itz so?????
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It is because there is a lid type thing which blocks the entrance to the wind pipe while you are drinking water or swallowing something.hope this helps you .
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