Histology/Physiology of Small Intestine

Question 1

What cells will you find in the crypts of Lieberkuhn?

Answer 1

goblet cells
lymphocytes cells
enteroendocrine cells
paneth cells
Enterocytes

Question 2

What are the sites of digestion in the small intestine?

Answer 2

Intraluminal, Apical membrane of enterocytes, cytoplasm of enterocytes

Question 3

What are lacteals?

Answer 3

Lympatic capillaries in the intestinal villi

Question 4

What carbohydrate transporters will you find in the small intestine

Answer 4

SGLT

GLUT2 and GLUT5

Question 5

What’s the maximum absorptive capacity of the small and large intestine for water in 24 hours?

Answer 5

12 and 5 liters respectively

Question 6

What is the BER and what sets it?

Answer 6

Basal electrical rhythm
Interstitial cells of Cajal
8-12/minute in the small intestine

Question 7

What types of contractions are there?

Answer 7

Phasic
-Segmental
-Peristaltic 
Tonic
-Sphincters

Question 8

What type of movements of are there in the colon?

Answer 8

Mixing (haustration)
Haustral (haustration)
Mass Movements
-lose haustra and contractile ring moves along for 30 seconds

Question 9

What do paneth cells secrete?

Answer 9

Defensin

kills bugs in the lumen