Question

There is a link between trachea and oesophagus at throat region. But why the oxygen not enter

in oesophagus and food particles not enter in the trachea?​

Answer 1

Lining the trachea are mucosal membranes comprised of epithelial cells, mucus-secreting goblet cells, and hair-like projections called cilia that move foreign particles up and out of the airway.

However, if a foreign object, liquid, or irritant (like smoke) enters the trachea, the muscles can contract violently, causing coughing to expel the substance.