Which structure prevents food from entering the trachea during swallowing?

Which structure prevents food from entering the trachea during swallowing?

• A. Esophagus
• B. Epiglottis
• C. Pharynx
• D. Uvula

Answer: (B)

During swallowing, the body protects the airway to prevent food from entering the trachea. The epiglottis is a leaf-shaped flap of cartilage that sits at the top of the larynx. As you swallow, the larynx rises and the epiglottis swings down to cover the opening of the airway (the glottis). This seal redirects the bolus into the esophagus instead of the trachea. Once the swallow is finished, the epiglottis returns to its upright position, allowing normal breathing to resume. The other structures serve different roles. The esophagus is the tube that carries food to the stomach. The pharynx serves as a common passageway for both food and air but does not actively block the trachea. The uvula helps close the nasopharynx to prevent nasal regurgitation during swallowing, not the trachea.

During swallowing, the body protects the airway to prevent food from entering the trachea. The epiglottis is a leaf-shaped flap of cartilage that sits at the top of the larynx. As you swallow, the larynx rises and the epiglottis swings down to cover the opening of the airway (the glottis). This seal redirects the bolus into the esophagus instead of the trachea. Once the swallow is finished, the epiglottis returns to its upright position, allowing normal breathing to resume.

The other structures serve different roles. The esophagus is the tube that carries food to the stomach. The pharynx serves as a common passageway for both food and air but does not actively block the trachea. The uvula helps close the nasopharynx to prevent nasal regurgitation during swallowing, not the trachea.