Flashcards in GI Facts Deck (22)
What does the myenteric (Auerbachs) plexus have to do with the small bowel system?
It affects peristalsis and GI motility
located inbetween longitudinal and circular SM layers
What peptide causes the gallbladder to contract the most?
What will give you the most basic pancreatic secretions?
Secretins affect on pancreas
(decrease gastric acid and increase bicarb)
what hormones is paracrine and what are its actions?
inhibits gastrin release
Serotonin (EC cell)
gut motility and secretions
Histamine (ECL-cell and mast)
stimulates gastric acid secretion
What does achalasia mean?
Food stays in your esophagus because lower esophageal sphincter does not relax because there is no VIP coming from the vagal nerve
what prevents gastric emptying into the duodenum?
(due to the change in acidity?)
what reflex gives you defecation?
peristaltic contractions in the colon, aka mass movement
if you have a pancreatic tumor that secretes too much gastrin and gives you a really acidic stomach, which of the enzymes will not be working?
Lipase which will mess up your fat absorption as well
What will happen to the gastric venous pH if you give a drug (omaprezole) that blocks H release in the stomach?
pH will fall
pancreatic secretion flow rates?
increase in flow rate will give you a decrease in chloride
If you block the common bile duct, what happens to levels of conjugated bilirubin in the plasma, unconjugated bilirubin in the plasma, and conjugated bilirubin in the urine?
What happens to osmolarity of the bile once it reaches the gallbaldder?
hyperosmolar because of concentration
What happens to bile acid synthesis after an ileal resection?
it will go up because all your bile is not being absorbed anymore it is being excreted
What will decrease glucose transport across an epithelial cell of the small intestine?
if give galactose because it completes with the Na/glucose symporter
What happens at the unstirred mucosal layer of small intestine?
thats where lipids get absorbed??
Questions on toxins and drugs causing diarrhea, cholera and ouabain.
increase the cyclic amp levels which increases secretions of chloride into the lumen
Absorption of what will be affected if there are no bile salts?
absorption of any of the fat soluble vitamins (A,D,E,K)
short chain fatty acids?
do not need to be formed into micelles
Know the pictures of the digestive system?
esophagus, stomach, duodenum, jejunum, ileum, cecum, colon and rectum
stomach to colon for mass movement
requires both ENS and extrinsic (ANS) to signal
stomach to ileum --> increases motility and relax IC valve
requires ENS and hormones (CCK and gastrin) possible ANS