The throat includes the esophagus, windpipe (trachea), voice box (larynx), tonsils and epiglottis. Epiglottitis is a potentially life-threatening condition that occurs when the epiglottis — a small cartilage "lid" that covers your windpipe — swells, blocking the flow of air into your lungs.

What covers the trachea as you swallow?

The epiglottis is flap of cartilage located in the throat behind the tongue and in front of the larynx. ... When a person swallows the epiglottis folds backward to cover the entrance of the larynx so food and liquid do not enter the windpipe and lungs.

What covers the tracheal opening?

Due to their proximity, a small piece of cartilage in the larynx automatically covers the opening of the trachea to prevent food or drink from getting into it when the person is eating.