Biology for IGCSE & O level - Human Nutrition (Section 8 - No. 20)
During swallowing, the epiglottis functions to:
Produce saliva.
Close the opening to the trachea.
Relax the esophageal muscles.
Increase the speed of food movement.
Explanation
The epiglottis closes over the trachea to prevent food from entering the airway during swallowing.
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