Biology / Unit 12 Bio 2801 short lesson, about 20 seconds
Hormonal Control: Gastrin, Secretin, CCK
Captions available
The idea
Gastrin stimulates stomach acid release; secretin triggers pancreatic bicarbonate to neutralize chyme; cholecystokinin triggers pancreatic enzymes and gallbladder bile release, coordinating digestion across organs.
In practice
Fatty chyme entering the duodenum triggers cholecystokinin release, prompting bile delivery exactly when fat needs emulsifying.
Where people slip
Somatostatin, not gastrin, is the hormone that stops acid release once the stomach empties — the two work in opposition.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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