The mnemonic
Gastrin Stomach, CCK gall, Secretin bicarbonate
What each word stands for
- GastrinG cells of the stomach raise acid
- CCKI cells of the duodenum contract the gallbladder
- SecretinS cells of the duodenum stimulate bicarbonate
Why it matters clinically
Explains Zollinger–Ellison and gallbladder responses to fat.
Where it stops being reliable
It leaves out GIP, motilin and others.
Teaching aid, still awaiting independent review. Confirm facts in a standard source.