NUR 406 GI Exam 3

NUR 406 GI Exam 3
1. GI tract AKA
alimentary canal
2. mouth
reservoir for chewing and mixing of food with saliva
3. tast buds
chemoreceptors that detect,
- salty
- sour
- bitter
- sweet
4. olfactory nerve CN1
taste and smell
5. how many permanent teeth do we have
32
6. esophagus
- upper 1/3 striated (motor neuron innervations)
- middle 1/3 mixed striated and smooth
- lower 1/3 smooth (vagus nerve, involved in relaxation)
7. upper esophagus sphincter role
keeps air from entering the esophagus
8. lower esophagus sphincter role
gastroesophageal, allows for the passage of food into the stomach, tightens to prevent reflux.
(hiatus, where the diaphragm is and esophagus passes through into the stomach)
9. phases of swallowing
1. oral phase
2. pharyngeal phase
3. esophageal phase
10. steps ofswallowing
1. the bolus entersthe pharynx and the soft palate closes the nasal cavity
2. the larynx rises up to meet the epiglottis. the bolus presses on the epiglottis and bends it
downward, closing the opening to the windpipe
3. the bolus enters the esophagus 

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