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GI physiology > gastric secretions-osmosis > Flashcards

gastric secretions-osmosis Flashcards

1
Q

what is a food bolus partially digested into

A

chyme

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2
Q

route of chyme

A

passes through pyrloci pshincter into duodeum

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3
Q

how is the pancreas connected to the duodenum

A

pancreatic duct

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4
Q

layers of stomach

A

mucosa
submucosa
muscularis externa
serosa

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5
Q

what does the mucosa contain

A

glands with cells which scerete components of gastric juie

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6
Q

what do parietal cells secrete and where are they located

A

in body of sotmach, secrete hcl

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7
Q

HCL

A

strong acid which helps break down porteins

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8
Q

chief cells

A

secre pepsinogen- inactive

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9
Q

how is pepsin created

A

once pepsinogen is exposed to pepsin

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10
Q

what do g cells secrete

A

gastrin

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11
Q

where is gatsrin secreted into

A

blood stream

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12
Q

what does gastrin enhance

A

hcl, pepsinogen ad contraction of stomach muscles

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13
Q

what does the usbmucosa cintain

A

connective tissue
blood vessels
nerv

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14
Q

what do the nerves connect to form

A

submucosal plexus of nerves

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15
Q

role of submuocsal plexus of nerves

A

regulates gastric secretions and controls blood flow to stomach

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16
Q

externa

A

contains 3 layers of muscle

17
Q

peristalsis

A

when the 3 layers of muscle contract in wave form s

18
Q

thickness in stomach

A

increases form orad to caudad to help push food towards pylroic sphincter

19
Q

which contorls the rate at which the stomach contracst

A

enteric nervous system

20
Q

what is composed of the ENS

A

myenteric and submucosal plexuses

21
Q

role of parasympathetic on ENS

A

increases gastric secretion anf motility

22
Q

sympa

A

inhibits hastrci secretion and motiltiy

23
Q

what do mechanoreceptors trigger the release of

A

gastrin from g cells in stomach

24
Q

what do mechanoreceptors sense

A

distnesion ins tomach from food

25
Q

what do high fat foods stimulate

A

release of CCK

26
Q

what is ccK released form

A

i cells in duodenum

27
Q

effect of cck

A

slows contractions to aid digestion

28
Q

what do s cells secrete

A

secretin

29
Q

function of secretin

A

Increases secretion of bicarbonate-rich fluid from pancreas and hepatic duct cells, decreases gastric acid secretion, trophic effect on pancreatic acinar cells

30
Q

what do d cells secrete

A

somatostatin

31
Q

function of somatostatin

A

Decreases acid and pepsin secretion, decreases gastrin secretion, decreases pancreatic enzyme secretion, decreases insulin and glucagon secretion
inhibits trophic effects of gastrin, stimulates gastric mucous production

GI physiology (5 decks)

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