GI Part 8- 2 Flashcards
What part of the stomach has the grinding and sieving function, it breaks solid pieces of food down into particles small enough for small-intestinal digestion?
Gastric pump- distal region
What part of the stomach has the function of storing and retains food as it awaits entry into the small intestine?
Gastric reservoir
What is the sequence of the gastric pump?
1- tonic contraction of fundus
2- strong peristaltic wave in corpus
3- passage into grinder and into pylorus
4- emptying of fluid and pre-digested particles into the duodenum
Increased pressure after stomach filling induces a reflective __________ of the stomach
Relaxation
Receptive relaxation —> ______ center = 2 options
1- _______ relaxation
2- inhibitory vagus fibers (NANC) = short term relaxation
Adaptive
Nutrients into stomach = feed back _________
Relaxation
What digestive pattern is:
Peristaltic waves —> fast aboral migrating contractions
Propulsive pattern
What digestive pattern is:
Segmentation contractions —> localized contractions of circular muscular, small segments of the intestine contract tightly dividing the gut into 2 segments of contracted and dilated lumen
Non-propulsive pattern
What peroid in the small intestine is:
Time in which stomach and small intestine are empty between meals —> it lasts typically 80-120 mins?
Interdigestive period
What motility pattern is:
Helps pushing undigested material out of the intestine
Control of bacterial population
Migrating motoric complex (MMC)
What phase of MMC is:
Motoric rest, no contractions
1
What phase of MMC is:
Intermittent and irregular contraction, sometimes isolated stronger ones
2
What phase of MMC is:
Strong peristaltic contractions starting from the stomach and migrating distally to reach the colon?
3
Where is mixing the most common?
Colon
Molitity patterns in teh large intestine are:
Peristaltic waves
__________ waves = oral migrating contractions that impede the movement of ingesta, causing a more intense mixing activity
Antiperistaltic
