How is swallowed food prevented from entering thenasopharynx?
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
Related questions
Question
How is swallowed food prevented from entering the
nasopharynx?
Expert Solution

Step 1
The tongue pushes the food into the pharynx. The food on reaching the opening activates sensory receptors to initiate the swallowing reflex. The pharynx is present behind the mouth and nasal cavity above th esophagus and trachea that reach the stomach and lungs. The uvula is present that prevents food from entering the nasopharynx. The epiglottis moves downwards to prevent food from entering the larynx and trachea to go to the esophagus.
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