Hormonal Control of Digestion

Chap 12 p 220

What are hormones?

Hormones:

• A substance made by one set of cells that affects a different, specific set of cells

• Endocrine Function: transported to target in blood

Hormones in Digestion

Hormone Stimulated By:

Made By: Site of Action

Description of Action

1. Gastrin

High protein meal

By lower stomach

Upper Stomach

Increases production of Gastric Juice

Hormones Digestion

Hormone

Stimulated By:

Made By:

Site of Action

Description of Action

2. GastrinInhibitory Peptide(GIP)

Increased activity of gastral glands

Duodenum(first part of small intestine)

Upper Stomach

INHIBITS production of gastric juice

Hormones in DigestionHormone

Stimulated By:

Made By:

Site of Action

Description of Action

3. Secretin

Acid in chyme

Duodenum

PancreasGallbladder

Stimulates release of pancreatic juices& of bile

Hormones Digestion

Hormone Stimulated By:

Made By:

Site of Action

Description of Action

4. CCK(CholeCystoKinin)

Partially digested protein & fat

Duodenum

PancreasGallbladder

Stimulates pancreatic juicesStimulates release of bile

The Small Intestine

• Pg 219-220

Small Intestine

•Chemical Digestion

in Duodenum (first 25cm)

•Absorption Villi