Question

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 tachea. why???

Answer 1

The openings of the pahrynx and very close to each other bt still food does not enter the trachea mainly because of a structure called epiglottis. Epiglottis is a flexible flap at the superior end of the larynx. it acts somewhat like a switch between the trachea and the larynx and thus it permits air to enter the trachea and food only to enter the larynx alone.

Hope that the answer is satisfactory. :)

Answer 2

The food does not enter into trachea because during swallowing, the aperture leading to trachea  (glottis) gets covered by a cartilaginous flap called epiglottis and the food has no other passage except  going into the oesophagus.