GI motility

Question 1

what nervous system controls GI movement?

Answer 1

enteric

Question 2

what are the sphincters and what are they made of?

Answer 2

circular muscle thickening. UES, LES, pyloric, odds, ileocecal, internal/external anal

Question 3

swallow phases

Answer 3

buccal, pharyngeal, esophageal

Question 4

submucosal plexus

Answer 4

deep, senses lumen, controls epithelium. blood flow/secretion

Question 5

myenteric plexus

Answer 5

between circular and longitudinal muscle, controls digestive tract motility (can change tone!)

Question 6

SM contraction

Answer 6

sheets of muscle linked with gap junctions. ICC cells maintain slow waves. lots of things can modulate SM

Question 7

ICC

Answer 7

interstitial cells of canal, pace makers, have gap junctions, between the muscle layers

Question 8

esophageal peristalsis

Answer 8

relax (NO,VIP) then contract (ACH) (Vagus)

Question 9

mass movement vs haustral

Answer 9

4 times a day (gastrin increases) vs every 30 min for 1 min