u9: digestion Flashcards
small intestine includes
and how about large intestine.
duodenum: majority of chemical digestion
jejunum + lieum: absorption
- where it takes the longest
most water reabsorbed in
small intestine (where most absorption happens)
types of GI motility
peristalsis= forward movement (propel food along gi tract)
segmentation= mixing
migrating motor complexs= strong sweeps
enteric NS vs autonomic NS
- “gut brain”
2> psns = inc digestion, sns= dec digestion
SGLUT 1, 5, AND 2
- na cotransport, glu/gal into cell
- fru in
- all out (basolateral)
person with high plasma will have
alkaline tide that persists between meals
increase release of cl ions from parietal cells
digestion in lipids (fat)
where does it begin, main site, what happens to fat
begins in mouth due to enzyme lingual lipase (not gastric- this is stomach).
main site is in small int
bile salts emulsify
they break big fat droplets into small ones
pancreatic lipase breaks triglycerides (not bile salts)
micelles bring lipids into cell
packaged into chylomicrons and exit, then enter lymph (not small int)
digestion of carbs
use of salivary and pancreatic amylase which breaks starch and turn into dissacharides
and then brush boarder enzyme turn it into monosac
use SGULT (1,5,2)
digestion of protein
pepsin (stomach) starts
use of trypsin, chymotrypsin
gastric digestion
his and gastrin release of hcl from parietal cells
both produce secretions invoved in digestion of protein
blocking hormone cholecytokinin (ckk)
this hormone promotes satiety (makes you feel full)
decrease release chymotripsinogen and amylase, prolong acid secretion by stomach, decrease satiety after meal
if blocking enterpeptidase
fewer AA absorbed by small int
secretin released (aka when eating something with high saturated fats)
inc H in duodenum as a result of release of chyme from the stomach via the pyloric sphincter
release of ckk in presence to the AA in chyme
where does most of the water come from
secretions made by cells and glands along the tract
