The structure that covers the opening to the trachea during swallowing, thereby preventing food from entering the air passageway, is the

The epiglottis is a flap that covers the opening to the trachea when you swallow.

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Glucose, also called grape sugar, blood sugar or corn sugar, is among the simplest and one of the primary naturally occurring sugars. produced naturally by plants as the primary photosynthesis product, it is heavily used by living beings as a main energy source and is necessary for cellular respiration. chemically, it is a monosaccharide carbohydrate and serves as a building block for complex sugars like starch.