Which structure prevents food from entering the trachea during swallowing?

• A. Arytenoids
• B. Laryngeal inlet
• C. Uvula
• D. Epiglottis

Answer: (D)

Food doesn’t just pass by chance; the airway has a built-in switch that shuts it off during swallowing. The epiglottis is a leaf-shaped cartilage that sits above the opening to the larynx. When you swallow, the larynx rises and the epiglottis tilts backward to cover the laryngeal inlet, effectively sealing off the entrance to the trachea. This redirect ensures the bolus goes into the esophagus instead of the airway. Other structures play different roles—arytenoids help regulate the vocal cords, the laryngeal inlet is just the opening being protected, and the uvula mainly helps separate the nasal cavity from the mouth during swallowing. The clamping action of the epiglottis is what most directly prevents food from entering the trachea.