Which of the following describes the function of epiglottis?

The epiglottis is a flap-like structure located at the base of the tongue. Its primary function is to prevent food and liquids from entering the larynx, trachea and lungs during swallowing. This action protects the respiratory system from the aspiration of foreign material, ensuring that ingested substances are directed to the oesophagus and into the digestive system.

Sound production is mainly associated with the vocal cords in the larynx. Bringing the air to body temperature is primarily associated with the nasal passages and the respiratory system. Creating a pressure gradient between the lungs and the atmosphere is the functino of diaphragm and intercostal muscles.