Final answer:
The larynx is responsible for protecting the airways during swallowing, primarily through the action of the epiglottis, which closes to prevent aspirated food from entering the trachea.
Step-by-step explanation:
The primary function of the larynx is to protect the airways during swallowing. The larynx plays a crucial role in preventing aspirated food from entering the trachea. During the act of swallowing, a flap called the epiglottis folds over the entrance to the larynx, which stops swallowed material from moving deeper into the respiratory tract. If food does start to enter the larynx by mistake, it triggers a cough reflex, often strong enough to expel the material back into the throat.
The pharynx, which involves both the respiratory and digestive system, allows air to pass from the nasal cavity to the larynx and swallowed food to go from the oral cavity to the esophagus. At the time of swallowing, the backward motion of the tongue and the epiglottis work together to give priority to swallowed substances over inhaled air.
The primary function of protecting the airways during swallowing is performed by the larynx. When swallowing occurs, the flap called the epiglottis closes over the entrance to the larynx, preventing swallowed material from entering the airways. If material does enter the larynx, it stimulates a cough reflex to expel it out of the larynx and into the throat.