transport n mixing of food

Question 1

describe chewing reflex

Answer 1

bolus -> reflex inhib of lower jaw muscles -> stretch reflex -> rebound contraction -> cycle repeats

Question 2

innervation of mastication muscles

Answer 2

cn 5

Question 3

describe the to n fro transfer of impulses during pharyngeal phase of swallowing

Answer 3

swallowing receptor area -> afferents (5, 9 cn) -> swallowing center -> efferents -> pharynx

Question 4

how does inc gastric food vol promote gastric emptying

Answer 4

vagal and local myenteric reflexes

Question 5

diff b.w. peristaltic rush and mmc

Answer 5

pr: si;rapid;due to irritation;rapid mmc: s&si;during fasting;slow

Question 6

describe parasymp defec reflex

Answer 6

feces in rectum -> distention -> afferents to sacral seg of s.c -> efferents thru pelvic n to desc colon, sig colon, rectum -> persistalsis moves feces analward