Final answer:
The cartilaginous epiglottis covers the laryngeal inlet when swallowing, preventing food from entering the trachea and respiratory system.
Step-by-step explanation:
The laryngeal inlet is covered by the cartilaginous epiglottis when swallowing. The epiglottis is a very flexible piece of elastic cartilage that folds downward, covering the opening to the larynx and effectively blocking access to the trachea and bronchi. This prevents food from entering the trachea and respiratory system.