Cholecystokinin

Definition

Cholecystokinin (CCK) is a hormone released by the small intestine in response to the presence of fats and proteins. It stimulates the gallbladder to release bile and the pancreas to secrete digestive enzymes, aiding in digestion.

5 Must Know Facts For Your Next Test

1. Cholecystokinin helps regulate satiety by signaling the brain to reduce food intake.
2. It is primarily produced in the duodenum and jejunum of the small intestine.
3. CCK's release is triggered when partially digested fats and proteins enter the small intestine.
4. This hormone also slows gastric emptying, allowing more time for nutrient absorption.
5. CCK plays a role in stimulating pancreatic enzyme secretion, necessary for macronutrient digestion.

Review Questions

• What triggers the release of cholecystokinin?
• How does cholecystokinin influence appetite?
• Which organs are directly affected by cholecystokinin during digestion?

Related terms

Gastrin:

A hormone that stimulates gastric acid secretion in response to food ingestion.

Secretin: A hormone that stimulates bicarbonate secretion from the pancreas to neutralize stomach acid in the small intestine.

Bile:

A digestive fluid produced by the liver and stored in the gallbladder, essential for fat emulsification.