Lecture 38-39- GI Secretions

Question 1

Primary mediator of HCl production

Answer 1

Acetocholine

Question 2

What is acetylcholine’s role in digestion?

Answer 2

Stimulate gastrin release which stimulates HCl prduction

Question 3

What enteric cells produce histamine

Answer 3

ECL

Question 4

Is stomach pH higher or lower whne fasting?

Answer 4

Lower

Question 5

What is triggered by acidic chyme entering the duodenum?

Answer 5

Secretin and CCK release

Question 6

Where is HCl and bicarbonate released in relation to a parietal cell

Answer 6

HCl is released on the lumenal side
Bicarbonate is released into the blood stream

Question 7

What pH change occurs in the blood after eating

Answer 7

Alkalization due to bicarbonate

Question 8

Why is pepsinogen stored in chief cells as granules

Answer 8

To prevent cell destruction

Question 9

What stimulates release of pancreatic secretions

Answer 9

Ach, secretin, and CCK

Question 10

What animal lacks a gallbladder

Answer 10

Horses

Question 11

What stimulates gallbladder contractions

Answer 11

CCK

Question 12

What chemical is the precursor for bile

Answer 12

Cholesterol

Question 13

What is a bile salt

Answer 13

A bile acid bound to an amino acid

Question 14

Which two amino acids can conjugate a bile acid

Answer 14

GLycine and taurine

Question 15

where is most bile reabsorbed

Answer 15

the ileum

Question 16

What does it mean when bile acids increase dramatically after a meal

Answer 16

Liver shunt

Question 17

Where are bile acid micelles formed

Answer 17

THe lumen of the intestines