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Physiology Exam V > Introduction to GI > Flashcards

Flashcards in Introduction to GI Deck (51):
1

Enteric nervous system

branch of ANS located entirely within GI tract.

2

what is enteric nerous sytem recieve regulation from

PNS and SNS

3

Is Ach excitiory or inhibitory

excititory

4

function of Ach

vasodilation
increased secretion
smooth muscle contraction

5

is NO excitiory or inhibitory

inhibitory

6

function of NO

vasocontriction
inhibit smooth muscle contraction
decreased secretions

7

is serotonin excitiory or inhibitory

excitory

8

function of serotonin

vasodilation
increased secretion
smooth muscle contraction

9

is dopamine excitory or inhibitory

inhibitory

10

function of dopamine

inhibit ENS neuronal firing
acts on presynaptic D2 cells

11

is NO excitiory or inhibitory

inhibitory

12

function of NO

smooth muscle relaxation
vascular and GI

13

is VIP excitory or inhibitory

inhibitory

14

function of VIP

smooth muscle relaxation
vascular and GI

15

What are the primary regulators of GI smooth muscle

Ach, VIP, NO

16

resting slow wave

continous depolarization and repolarization

17

spike potential

potential for rapid depolarization at peak of resting slow waves, given an appropriate stimulus

18

function of spinctors

regulate antegrade and retrograde movement

19

upper esophageal spincter

closed during inspiration

20

lower esophageal spincter

prevents reflux

21

pylorix sphicter

regulates gastric emptying

22

iocecal spincter

ileum distension relaxes
ascending colon distension causes contraction

23

internal anal spincter

involuntary control
distension of rectum relaxes sphincter

24

external anal spincter

volutnary contraction can override defecation reflex

25

key regulators of spincter opening

NO and VIP cause relazatino

26

Source of CCK

duodenum

27

target of CCK

pancrease, gallbladder, stomach, spincter of oddi

28

function of CCK

increase enzyme secretion
increase contraction
decrease gastric emptying
increase relaxation

29

source of gastrin

G cell

30

target of G cell

parietal, ECL, D cell

31

function of gastrin

promote gastric acid secretion

32

source of motilin

upper GI

33

target of motilin

stomach, duodenum

34

action of motilin

increase smooth muscle contraction (key player in MMC)

35

source of peptide YY

ileum, colon

36

target of peptide YY

panacrease

37

action of peptide YY

decrease enzyme and fluid secretion

38

source of secretin

duodenum

39

target of secretin

pancreas, stomach

40

action of secretin

increase bicard secretion
decrease acid secretion
delay gastric emptying

41

source of somatostatin

stomach, duodenum, pancreatic cells

42

target of somatostatin

stomach, intestine, pancreas, liver

43

action of somatostatin

decrease acid secretion
increase fluid absorption
decrease secretions
decrease bile flow

44

source of prostaglandin

stomach, intestine/immune cells

45

target of prostaglandin

stomach, intestine

46

action of prostatgland on the stomach

increase blood flow
decrease acid secretion
increase mucus/bicab secretion

47

action of prostaglandin on intestine

increase motility
increase fluid secretion

48

source of histamine

stomach, intestine/immune cells

49

target of histamine

stomach, intestine

50

affect of histamine on stomach

increase acid secretion

51

affect of histamine on intestine

increase fluid secretion