What actions prevent the pharynx from forcing food back intothe mouth or nose?

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
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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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What actions prevent the pharynx from forcing food back into
the mouth or nose?

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The pharynx is about 12 to 14 cm in length which is divided into three sections namely nasopharynx, oropharynx, and laryngopharynx. 
The nasopharynx is the posterior region of the nasal cavity that extends from the skull's base to the lower part of the cricoid cartilage. The oropharynx extends from the hard palate to the hyoid bone. The laryngopharynx extends from the superior boundary of the epiglottis to the lower boundary of the cricoid cartilage. 

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