Gastrointestinal Physiology Flashcards Preview

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Flashcards in Gastrointestinal Physiology Deck (55):
1

Plexus controlling the motility of the GI smooth muscle

myenteric plexus
Auerbach's plexus

2

Plexus controlling secretion and blood flow

submucosal plexus
Meissner's plexus

3

Most potent amino acid stimuli for gastric secretion

phenylalanine
tryptophan

4

Where is gastrin released?

G cells in antrum

5

Where is CCK released?

I cells in duodenum and jejunum

6

What lipids stimulate secretion of CCK?

Not triglycerides (cannot cross intestinal cell membrane)

7

Where is secretin released?

S cells in duodenum

8

Only GI hormone that is released in response to fat, protein and carbohydrates

GIP

9

Slow waves are least frequent in

stomach

10

Slow waves are most frequent in

duodenum

11

Relaxes GI smooth muscle

VIP

12

Tonicity of saliva

hypotonic

13

Tonicity of pancreatic secretion

isotonic

14

Second messenger for secretin

cAMP

15

Second messenger for CCK

IP3 and Ca2+

16

Which lipid is not contained in micelles

glycerol

17

Site of secretion of intrinsic factor

fundus

18

The autonomic nervous system controls gut motility by
changing which of the following?
A) Pacemaker discharge frequency
B) Slow wave frequency
C) Spike potential frequency

spike potential frequency

19

What is the effect of hyperosmotic solution in the intestine on acid secretion?

inhibit

20

What is the effect of isoosmotic solution in the intestine on acid secretion?

no effect

21

muscle layers of the stomach

inner oblique
middle circular
outer longitudinal

22

most potent stimulti for gastrin secretion

phenylalanine
tryptophan
methionine

23

depolarization of slow waves

sodium influx

24

depolarization of spike potentials

calcium influx

25

satiety center

ventromedial thalamus

26

appetite/hunger center

lateral thalamus

27

anorexigenic neurons

POMC

28

orexigenic neurons

neuropeptide Y

29

anorexigenic substance

ghrelin

30

parotid gland secretes what type of secretion?

serous

31

submandibular gland secretes what type of secretion?

mixed

32

sublingual gland secretes what type of secretion?

mixed

33

which gastric glands contain mucus neck cells, parietal cells and chief cells?

oxyntic glands (body)

34

which gastric glands contain G cells and mucus cells?

pyloric glands (antrum)

35

gastric cell secreting histamine

enterochromaffin-like cells

36

gastric cell secreting serotonin

enterochromaffin cells

37

majority of gastric acid secretion: cephalic phase, gastric phase or intestinal phase?

gastric phase

38

CCK-A receptors are found in

pancreas

39

CCK-B receptors are found in

stomach

40

Cholic acid and chenodeoxycholic acid are primary or secondary bile acids?

primary bile acids

41

deoxycholic acid is from cholic or chenodeoxycholic acid?

cholic acid

42

lithocholic acid is from cholic or chenodeoxycholic acid?

chenodeoxycholic acid

43

absorption of glucose and galactose from lumen to intestinal cell

SGLT-1

44

absorption of fructose from lumen to intestinal cell

GLUT-5

45

absorption of glucose, galactose and fructose from intestinal cell to blood

GLUT-2

46

is pepsin essential for protein digestion?

no

47

all lipids go to the lacteals except

small-chain fatty acids

48

Bile salts inactivate pancreatic lipase. What pancreatic coenzyme is secreted to prevent this from happening?

Procolipase

49

main site for water absorption

jejunum

50

Potassium is absorbed in __ and secreted in __.

Potassium is absorbed in small intestine and secreted in large intestine.

51

primary ion secreted in intestinal lumen

Cl-

52

where is iron absorbed?

duodenum

53

most of the nutrients are absorbed where?

jejunum

54

amino acids are cotransported with what ion?

Na+

55

dipeptides and tripeptides are cotransported with what ion?

H+