NS115 Lecture 4 - LECTURE 4 9/7/09 The Stomach: Swallowing:...

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LECTURE 4 9/7/09 The Stomach: Swallowing: Esophagus: problem is, its right in the back of the trachea, don’t want to get food in your trachea. The epiglottis closes off the trachea during swallowing so that food doesn’t get in Past the epiglottis, goes down the esophagus. There are touch receptors on the back of the Throat that activates a series of movements in the entire GI tract; it starts a series of peristaltic contractions (sequence of reflexes in the GI tract, muscular contractions [pushing] and relaxations [pulling] that push eht food all the way through. Esophageal Sphincter: (ring of cirvular muscles) “tone” is modulated by parasympathetic Can be voluntarily controlled a. belchers b. peer pourers c. sword swallowers 1. purgers i. gastric cells: tumor necrosis factors trigger vomiting ii. severe consequences: esophageal lesions, tooth decay,cardiac irregularities Incomplete closure: heartburn (nothing to do with your heart). Gastroesophageal Reflux Disease (GERD). Sympathetically mediated stress
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NS115 Lecture 4 - LECTURE 4 9/7/09 The Stomach: Swallowing:...

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