GI 6 Flashcards
what are the two monosaccharides absorbed
fructose
glucose
what are the two broad categories of enzymes for protein digestion
endopeptidase
exopeptidase
do all proteins digested come from ingested foods
no
what do endopeptidases do
attack peptide bonds and form fragments
what is the endopeptidase in the stomach
pepsin
what is the endopeptidase in the small intestine
trypsin
what do exopeptidase do
cleave single amino acids from the end of polypeptide chains
what are aminopeptidases
cleave from the amino terminal end
what are carboxypeptidases
they cleave from the carboxyl terminus of polypeptide chain
what are the 2 exopeptidases
aminopeptiase
carboxypeptidase
whats the most prominent exopeptidase
carboxypeptidase
what are vitamins absorbed with
fats
what is vitamin B12 absorbed with
absorbed in the ileum after forming complex with intrinsic factor
how does mineral absorption occur
active transport
is paracellular absorption regulated
no
is transcellular transport regulated
yes
what is transcellular transport regulated by
Vitamin D3
where is most water absorbed
small intestine
what digestive enzyme cleaves proteins into smaller polypeptides
endopeptidase
what is intestinal motility primarily influenced by
ENS neurons (myenteric plexus)
in the fed state, what is contraction like
more segmental
what kind of input is the fed state stimulated by
increased parasympathetic input (long reflexes)
what is used during the fasted state
migrating motor complex
what is a cleansing system within GI
migrating motor complex
