Which structure prevents food and liquids from being imhaled when a person swallows?

The structure that prevents food and liquids from being inhaled when a person swallows is the epiglottis. This flap-like cartilage covers the entrance to the trachea during swallowing, directing food and liquids into the esophagus instead. This mechanism helps prevent aspiration and ensures that the airway remains clear during the swallowing process.