Small Intestine and Associated Structures Flashcards
tube that carries chyme away from stomach and deposits it in the large intestine
small intestine
three distinct parts of the SI
duodenum
jejunum
ileum
the SI is suspended from the body wall by what
mesentery
receives chyme through pyloric sphincter
duodenum
most chemical digestion and absorption occur in this section
jejunum
longest part of the SI
jejunum
empties into large intestine
ileum
ileum/LI intestine intersection in horse
cecum
ileum/LI intestine intersection dog and cat
colon
ileum/LI intestine intersection ruminant and pig
cecum and colon
where are prominent Peyer’s patches found
ileum
adaptions in the SI help increase what
surface area
the SI is long with many _____ and _____
loops and coils
folds in mucosal lining
plications
finger like projections in mucosa
villi
smaller projections off villi
microvilli
what do the microvilli in the SI form
brush border
found on villi and replace cells on villi as they are lost due to wear
intestinal crypts (crypts of Langerhans)
lymphatic capillaries
lacteals
lacteals carry absorbed lipids and fat-soluble substances to ____ ____ and into ____ _____
thoracic duct
vena cava
where are lacteals found
on the villi
blood capillaries in the villi collect some of the absorbed nutrients and transport them where
to the liver
two hormones secreted by duodenal mucosa in the SI
cholecystokinin (CCK)
secretin
CCK inhibits what
gastric emptying
CCK causes increased secretion of ______ and _______ digestive enzymes
bicarbonate
pancreatic
gall bladder contraction is triggered by what
CCK
CCK stimulates the secretion of what, from the duodenal mucosa
enteropeptidase
stimulus for CCK secretion are high _____ acid or _____ acid concentrations OR low pH of _______ entering duodenum
amino
fatty
chyme
what decreases HCl production in the stomach
secretin
secretin increases ________ and _______ _______ secretions
pancreatic
biliary bicarbonate
