Chapter 40.3

Chapter 40.3 - 2. Pharynx a. Structure and Location 1....

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2. Pharynx a. Structure and Location 1. entrance to digestive and respiratory tract 2. epiglottis: covers opening to respiratory tract—prevents choking b. Function: swallowing Swallowing Step by step During the voluntary phase, a bolus of food is pushed by the tongue against the hard palate towards the oropharynx. During the pharyngeal phase, the soft palate is elevated, closing off the nasopharynx. Contraction of muscles in the pharynx force the bolus towards and into the esophagus As the pharynx is contracting the upper esophageal sphincter is relaxing, thus allowing the bolus to enter the esophagus. Esophageal phase: the bolus is moved by peristalsis towards the stomach. C. Pathway of Food 3. Esophagus a. Structure and Location Muscular tube Transports food from pharynx to stomach b. Function: transports food by peristalsis Peristalsis wavelike contraction Responsible for moving food through the digestive tract C. Pathway of Food 4. Stomach a. Features of the stomach 1. sac shaped organ
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Chapter 40.3 - 2. Pharynx a. Structure and Location 1....

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