Ch. 8 Digestive System Enzymes & Hormones
Enzyme
Amylase
Where it’s secreted from
Salivary glands: upon sight, smell,
taste or thought of food
Pancreas: Upon stimulation by
hormone secretin
Lipase
Pancreas: presence of lipids in the
small intestine
Trypsinogen
Trypsin
Pancreas:
Trypsinogen gets converted into
trypsin when it interacts with
enterokinase
What it acts upon
Chemically digests starches into
disaccharides
Test for starchiodine
Test for disaccharides Benedict’s
Chemically digests lipids into fatty
acids and glycerol
Test for lipidstranslucence, Sudan
IV
Chemically digests proteins; breaks
them down into long and short
chained polypeptides
Test for proteinBiuret; turns purpleviolet when positive
FINISH chemical digestion of proteins,
changing short chain peptides into
amino acids
Erepsin
Pancreas and small intestine
SECRETINacts as a chemical
messenger, tells pancrease to
release pancreatic fluids
Disaccharidases
Enzyme that digests double sugars
into single sugar units. Released
from small intestine
Complete the digestion of
carbohydrates
HORMONE
Gastrin
Where it’s secreted from
Stomach: presence of food and
partially digested proteins
What it acts upon
Targets stomach: Signals the release
of HCL from the stomach,
CCK (cholesystokinin)
Small intestine: upon the presence
of fats
Targets gall bladder: Stimulates the
release of bile salts to physically break
down fats
Enterogastrone
Small intestine: upon presence of
fatty foods,
Decreases gastric secretions and
motility (slows down peristalsis);
allows for more time for digestion and
absorption of fats
Secretin
*inactive: prosecretin
Small intestine: upon presence of
HCL from stomach it is activated
from prosecretin to secretin
Targets pancreas: release HCO3- ions
to neutralize acid