GI Part 6- 1

Question 1

What intestinal organ has high permeability and low resistance?

Answer 1

Jejunum

Question 2

What intestinal organ has medium permeability and resistance?

Answer 2

Ileum

Question 3

What intestinal organ has low permeability and high resistance?

Answer 3

Colon

Question 4

What percent of water absorption takes place in the small intestine?

Answer 4

85%

Question 5

What percent of water absorption takes place in the large intestine?

Answer 5

14%

Question 6

What part of the small intestine has the highest amount of water absorption?

Answer 6

Duodenum

Question 7

Do the following favor inefficient or efficient absorption?
Increasing resorption surface
Mucosa uptake mechanisms
High blood perfusion
Permeability

Answer 7

Efficient

Question 8

What transport is very efficient since it represents the driving force for most transport processes?

Answer 8

Na+

Question 9

What is absorbed by carriers as well as passive through the paracellular pathway?

Answer 9

Chloride

Question 10

What is mainly absorbed in the small intestine through the paracellular pathway?

Answer 10

K+

Question 11

What vitamin is associated with the kidneys?

Answer 11

Vitamin D

Question 12

What increases apical Ca++ channels, calbindin synthesis, Ca++ ATPase?

Answer 12

Calcitriol

Question 13

What is Calcitriol ?

Answer 13

Active form of vitamin D

Question 14

What is the protein produced by the salivary gland that binds to free vitamin B-12?

Answer 14

HC- haptocorrin

Question 15

What hydrolyzes HC and free’s B-12?

Answer 15

Trypsin

Question 16

Where does the HC separate from the free vitamin B-12, and the free B-12 binds to IF?

Answer 16

Duodenum

Question 17

Where is trypsin found?

Answer 17

Pancreas

Question 18

Where does the receptor mediated endocytosis take place during absorbing of vitamin B-12?

Answer 18

Ileum

Question 19

Where does HC and free vitamin B-12 bind?

Answer 19

Stomach