24.7 swallowing Flashcards
1
Q
what are the 3 phases of swallowing?
A
voluntary
pharyngeal reflex
esophageal reflex
2
Q
what happens during the voluntary phase of deglutition?
A
bolus of food is moved by tongue from oral cavity to pharynx
3
Q
what controls the pharyngeal reflex?
A
swallowing center in medulla oblongata
4
Q
what happens during the pharyngeal reflex of swallowing?
A
soft palate elevates
upper esophageal sphincter relaxes
elevated pharynx opens the esophagus
food is pushed into the esophagus
5
Q
how is the esophageal reflex triggered?
A
stretching of the esophagus causes enteric NS to initiate peristalsis of muscles in the esophagus
