GI quizzes

Question 1

where are bile acids reabsorbed?

Answer 1

ileum

Question 2

what does lysozyme do to bacteria?

Answer 2

cleaves the polysaccharide component of the cell wall

Question 3

most amino acids are absorbed where?

Answer 3

jejenum

Question 4

What do brunners glands secrete?

Answer 4

bicarbonate

Question 5

what stimulates brunners glands to secrete?

Answer 5

secretin

Question 6

how and where is fructose absorbed?

Answer 6

in the small intestine via facilitated diffusion through GLUT-5

Question 7

How are glucose and galactose absorbed?

Answer 7

actively transported coupled to Na absorption

Question 8

Does the arrival of food in the stomach stimulate segmentation contractions?

Answer 8

yes

Question 9

what catalyses the activation of trypsinogen and where?

Answer 9

enterokinase in the duodenum

Question 10

which cells secrete pepsinogens?

Answer 10

chief cells

Question 11

what do parietal cells secrete?

Answer 11

HCl

Question 12

does glucose absorption happen in the crypts of the villi of the small intestinal lining ?

Answer 12

villi epithelial cells

Question 13

what effect does sympathetic activity have on segmentation contractions?

Answer 13

decreases

Question 14

What effect does lowering pH have on gastrin secretion?

Answer 14

lower pH inhibits gastrin secretion

Question 15

what does gastrin do?

Answer 15

stimulates the realease of HCl from parietal cells

Question 16

what does cholecystokinin do?

Answer 16

stimulates pancreatic enzyme secretion and bile secretion

Question 17

what happens to the basic electrical rhythms frequency from mouth to anus?

Answer 17

decreases from mouth to anus

Question 18

whats the basic electrical rhythm?

Answer 18

The basal or basic electrical rhythm or electrical control activity is the spontaneous depolarization and repolarization of pacemaker cells in the smooth muscle of the stomach, small intestine, and large intestine. This electrical rhythm is spread through gap junctions in the smooth muscle of the GI tract.

Question 19

where is vitB12 / intrinsic factor absorbed?

Answer 19

in the terminal ileum

Question 20

How do trypsinogen and other zymogens get activated ?

Answer 20

trysinogen converted to trypsin via the duodenal brush border bound enterokinase. All other zymogens are activated via trypsin.

Question 21

where in the stomach are the peristatltic waves the strongest?

Answer 21

the antrum cuz the muscle is thick

Question 22

which cells secrete secretin?

Answer 22

S cells

Question 23

where are S cells found?

Answer 23

in the duodenum and jejunum