GI - Regulatory substances

Question 1

Cholecystoknin

Answer 1

I cells (duodenum, jejunum)

CCK acts on neural muscarinic pathways to cause pancreatic secretion.

Remember: I call my kin about paying dues in June, for borrowing my pan.

Question 2

Glucose-dependent insulinotropic peptide

Answer 2

K cells (duodenum, jejunum)

Decrease gastric H+ secretion.
Increase insulin release.

Remember: Kathy gypped me of my dues in June; I lost my assets (acid) but I had insurance (insulin).

Question 3

Gastrin

Answer 3

Gastrin is released from G cells.
It stimulates ECL cells –> Histamine
Parietal cells –> H+