Digestion 2 Flashcards
what phases can regulation of the stomach be divided into
cephalic, gastric, and intestinal phases
describe what happens during cephalic regulation
thinking or smelling food
secretion of acid happens sometimes even before food enters the mouth
why does secretion of acid happen sometimes before food enters the mouth
stomach churns due to habituation of getting food
due to vagus nerve and parasympathetic (long reflex)
what is an example of something that triggers cephalic regulation
depression can cause loss of appetite and inhibit digestion
describe when gastric regulation occurs
several hairs after eating food
describe what happens during intestinal regualtion
occurs in the intestines
primarily inhibits digestion due to enough food in intestine (slows food emptying)
gastric inhibitory peptide
what does the stomach act as a gatekeeper for
intestine
what does it mean for the stomach to be a gatekeeper for intestine
prevent intestine from having too much food at once
stomach has ability to store food for a little bit unlike intestine
why do you not want to overload intestine
it is where absorption happen
how often does small bolus go into the small intestine
every 3 minutes
what is suited for chemical digestion and absorption
small intestine
what does the small intestine have a large amount of
surface area due to the layers of folding
what finger like projection is on each fold of the small intestine
villi
what does the villi do
creates surface area
what grabs amino acids and transports them across membrane into the blood
absorptive cells
what do the goblet cells do
secretes mucus to get food liquefied and moving along
what has a rich blood supply
interior of villus
where does digestion of proteins begin and end
begins in the stomach and is completed in the small intestine