If food goes down the trachea or wind pipe instead of the food pipe or oesophagus, the person is not able to breathe and starts choking.
Our trachea (wind pipe) and oesophagus (food pipe) are joined near the top and separate as we go down towards the diaphragm. A thin flap of cartilage called the epiglottis usually covers the trachea while we are swallowing, so that food does not move inside the wind pipe.
However under certain conditions like swallowing too fast, talking or not chewing the food properly, some of it may enter the trachea. This may cause the airways to get partially blocked, which is called as choking. Total blockage may result in the death of the individual.
Our nervous system responds immediately to the situation by trying to eject the food. This is done by tightening the muscles between the ribs, above the oesophagus and by expanding the cavity of the throat.
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