GI 6

Question 1

what does motilin do?

Answer 1

secreted by MO cells , they increase intestine motility

Question 2

waht do MO cells do and where are they located

Answer 2

-stimulated by alkaline pH
-upper small intestine (duo)
-secretes motilin

Question 3

what is “entero”

Answer 3

pertaining to the small intestine

Question 4

what are accessory secretions?

Question 5

What are pancreatic secretions and what influences it

Answer 5

infleunce: sight, taste, gastrin and parasympathetic neurons

releases digestive enzymes

Question 6

enteropancreatic reflex

Question 7

S cells

Answer 7

secretin - inhibits gastric acid secretion
- inhibits gastric motility too
-stimulates duct cells

Question 8

chief cells

Answer 8

secretes the inactive form of the digestive enzyme, pepsinogen

Question 9

zymogen

Answer 9

inactive form of digestive enzymes

Question 10

parietal cells

Answer 10

two secretions

1. HCL - acti vates pepsinogen into pepsin
2. intrinsic factor - binds to vitamin B12, necessary for absorbtion of the vitamin

Question 11

what does pepsinogen do

Answer 11

kills pathogens, denatures protiens

Question 12

entroendocrine cells (G-cells)

Answer 12

G cells secrete the hormone gastrin into the blood

Question 13

I cells: chloecystokinin (CCK)

Answer 13

regulates pancreatic enzyme secretion

regulates bile scretion

stimulated by fatty acids

inhibits gastric acid procution and motility like S-cells

Question 14

K cells

Answer 14

(GIP) gastric inhibitory peptide

GLP-1: glucagon-like peptide

also inhibits gastric acid secretion and motility

Question 15

L cells

Question 16

large intestine role

Answer 16

store and concentrate fecal matter

Question 17

what valve connects the small and large intestine

Answer 17

ileocecal valve (opens when food enters stomach) its called the gastroileal reflex

Question 18

appendix role

Answer 18

stores gut bacteria (in case of illness)

Question 19

what secretion in lare intestine

Answer 19

secretion: moslty just mucus

digestion: no digestion in large
-bacteria break down stuff a bit (fermentation)(gases/farts)
ALSO PRODUCES VIT K

Question 20

what is motility like in the large intestine

Answer 20

slow (18-24hrs)

1. segmental contractions
2. haustral rolling or churning (caused by incomplete layer of the longetudinal muscles)
3. mass peristalsis (reason you gotta poo after you eat)