Which structure protects the entrance of the trachea?

The epiglottis is a flap-like structure that plays a crucial role in the respiratory and digestive systems by protecting the entrance of the trachea. When a person swallows, the epiglottis folds down over the larynx, preventing food and liquids from entering the trachea and directing them instead into the esophagus. This action helps to prevent choking and ensures that air flows freely into the trachea during breathing.

While the larynx does support the epiglottis and contains vocal cords, it is not the structure that directly protects the airway during swallowing. The pharynx is part of the pathway for both food and air but does not serve to specifically protect the trachea’s entrance. The glottis refers to the opening between the vocal cords and is not a protective structure in itself. Thus, the epiglottis is clearly identified as the primary protective mechanism for the tracheal entrance during the swallowing process.