Multiple choice Which part of respiratory system protects the lower airway from expiration? Uvula Palatine tonsil Hyoid bone Tongue Epiglottis Reveal answer Fill a bubble to check yourself E Correct answer Explanation The epiglottis is a leaf shaped structure, immediately posterior to the base of the tongue, above the larynx. When food or liquids are swallowed, the epiglottis closes over the larynx, protecting the lower airways from aspiration.