GI: Motility

Question 1

what is the purpose of gi motility

Question 2

what is gi motility controlled by

Question 3

what direction do action potentials travel in in gi smooth muscle

Question 4

how are gi smooth muscle cells connected

Question 5

explain how ap are transmitted through gi smooth muscle cells

Question 6

explain when a slow wave does and doesnt cause a contraction

Question 7

explain relationship between slow waves, ap, force and duration of gi muscle contaction

Question 8

what are interstitial cells of cajal

Question 9

where are cells of cajal found? what do they do?

Question 10

explain how ap are spread from cajal cells to non pacemakers

Question 11

what is the difference between heart pacemakers and cajal cells

Question 12

heart depols due to ____, cajal cells depol due to ___

Question 13

what stimulates depol of GI smooth muscle cell mem pot

Question 14

what stmulates gi tract cell hyperpol? why?

Question 15

explain the passage of food through the gi tract and what happens at each stage

Question 16

explain three steps of swallowing including role of the tongue, upper esoph spincter, and esophagus

Question 17

t/f: tongue movement is the same in voluntary and involuntary swallowing

Question 18

what nerves are involved in voluntary swallowing

Question 19

what nerves are involved in involuntary swallowing

Question 20

what does the tongue do in voluntary swallowing

Question 21

what happens in the mouth in involuntary swallowing

Question 22

how does the esophagus move food

Question 23

explain how peristalsis is initiated in the esoph

Question 24

what are the three steps of movement by peristalsis

Question 25

what is the vasovagal reflex and what does it alert

Question 26

how does the stomach accommodate food

Question 27

how does peristalsis act in the stomach? end result?

Question 28

where do contents from the stomach empty into?

Question 29

what is segmentation

Question 30

what is the purpose of segmentation in the small intestine

Question 31

what is the ileocecal valve

Question 32

how is the ileocecal valve opened? closed?

Question 33

what is the role of the large intestine

Question 34

how does the large intestine move contents

Question 35

parasymp vs symp effect on large int motility

Question 36

is defectation voluntary

Question 37

what do you need to relax in defectation? what do you need to contract?

Question 38

where is the vomiting center?

Question 39

what happens to the vagus nerve during vomiting?

Question 40

what happens to the spinal nerve during vomiting?

Question 41

what happens to the phrenic nerve during vomiting?