Gastric secretions

Question 1

functions of the stomach

Answer 1

starting point for digestion
mixes food with gastric secretions to produce semi liquid chyme
stores food before passing to small intestine
secretes gastric juice from gastric glands

Question 2

how is relaxation of orad region dirven

Answer 2

by vagus nerve during swallowing, opens lower sphincter allowing storage

Question 3

caudad region function

Answer 3

generate force to mix contetns and push towards duodenum

Question 4

what determines delivery of chyme to the duodenum

Answer 4

strength of antral wave or pump and opening of pyloric sphincter

Question 5

what is the strenght governed by

Answer 5

gastric and duodenal factors

Question 6

gastric factors

Answer 6

volume of chyme in stomach;

Question 7

consistency of chyme in relation to emptying

Answer 7

the thinner the better

Question 8

duodenal factors

Answer 8

delays emptying

Question 9

triggers for delay

Answer 9

fat
acid
hypertonicity

Question 10

what is HCL secreted by

Answer 10

parietal cells

Question 11

function of hcl

Answer 11

activates pepsinogen to pepsin

Question 12

role of intrinsic factor

Answer 12

binds vitamin b12, facilitating absorption

Question 13

role of gastroferrirn

Answer 13

binds fe2+ to facilitate absorption

Question 14

role of histamine

Answer 14

stimulates hcl secretion

Question 15

what is gastrin secreted by

Answer 15

g cells, stimulates hcl secretion

Question 16

what is somatostatin secrted by

Answer 16

d cells, inhibits hcl secretion

Question 17

what inhibits hcl secretion

Answer 17

somatostatin

Question 18

what stimulates hcl secretion

Answer 18

gastrin and histamine

Question 19

what is the cephalic phase

Answer 19

phase before food enters

Question 20

what happens during cephalic phase

Answer 20

thought, smell and taste stimulates vagus nerve to relase acc which directly activates parietal cells > hcl production

Question 21

what do parietal cells secrete

Answer 21

hcl, intrinsic factor, gastrin and histamine

Question 22

what is the gastric phase

Answer 22

when food is in the stomach

Question 23

what is the intestinal phase

Answer 23

once food has exited the stomach

Question 24

where is CCK secreted from

Answer 24

i cells in duodneum

Question 25

what is cck related to

Answer 25

gallstones

Question 26

cck function

Answer 26

promotes gallbladder contractility, causing the release of bile into the small intestine

Question 27

another function of cck

Answer 27

increased pancreatic secretions

Question 28

secretin role

Answer 28

increases secretion of bicarbonate-rich fluid from pancreas and hepatic duct cells