Flashcards in Digestion 3: Secretion Deck (111)
release of materials from cells that line the lumen of the GI
Where do secretion products end up?
- ISF: paracine action
- blood stream
- lumen of GI
where can goblet cells be found?
small & large intestines
which cells secrete mucus in the stomach?
largest endocrine system in the body is...
enteroendocrine cells (EEC)
- cells that secrete hormones in the GI
there are ___ types of EECs, and ___ types of GI hormones
EEC function is influenced by...
- GI contents
single cells scattered throughout the length of the GI; secrete hormones
Goblet cells refer to...
mucus secreting cells that is shaped like a goblet (more like a comma ",")
we take in about __ L of fluid a day, but there is __ L of fluid entering the GI tract in total due to...
secretions from the liver, pancreas, etc.
how much is secreted & absorbed in toe GI tract per day?
9 L total input
secretions into the GI include...
- gastric secretions
- pancreatic secretions
- intestinal secretions
secretions into the GI = ___x the volume of ____
how are fluids removed from the GI?
- absorption: small (main effect) & large intestines
- excretion: feces (small effect)
How is SA in the GI increased?
1) folds (3x)
2) hills & valleys (10x)
3) microscopic protrusions (20x)
SA increase method that can be found in the stomach
folds & valleys (no hills!)
folds on the inside of your stomach to allow expansion
valleys in the stomach =
gastric pits = opening to...
entrance to gastric glands are within the ___
anatomy: upper curve of the stomach
nearly closed cavity located immediately before the stomach outlet. It is lined by mucosa and it does not produce acid
hills & valleys =
hills = villi
valleys = crypts
SA increase methods that can be found in the small intestines
- folds (plica or valvulae conniventes)
- hills (villi)
- valleys (crypts of Lieberkuhn)
- microscopic protrusions (microvilli)
differences between rugae and plica
plica is in small intestines, and is permanent
Crypts of Lieberkuhn extend to...
into the mucosa of the small & large intestines
SA increase in large intestines
1) folds (haustra)
2) valleys (crypts of Lieberkuhn) - no hills!
when food pushes the haustra outwards, creating bulges & increased SA
what causes haustra in the large intestines?
lack of resistance underlying the circular muscle in the large intestine during segmentation