The flap of cartilage that closes to prevent the food and liquid from entering the air passage is called as epiglottis.
The glottis is a narrowest part of the larynx which opens into the airway. The vocal cords make their outer boundaries. The epiglottis, a sheet-like flap of cartilage, prevents food from entering the airways when swallowed. The epiglottis is a sheet of cartilage that closes the glottis to control the entry of food during swallowing. It covers the glottis and prevents food from passing during the swallowing process. It remains open during breathing, allowing air to enter the larynx. These are the function of the epiglottis.
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