Chemical Digestion Enzymes

serous cells of the salivary glands

• secrete salivary amylase

• substrate = starches (carbs)

• product = dextrin & maltose

chief cells in stomach

• secrete pepsin (as pepsinogen)

• substrate = proteins

• product = peptides

parietal cells of stomach

• secrete HCl

• substrate = pepsinogen activation (proteins)

• product = pepsin

parietal cells of stomach

• secrete intrinsic factor

• used for Vit B12 absorption

mucous cells of stomach

• secrete mucous

• used for protection

liver

• secretes bile salts

• for emulsification of fats

acinar cells of pancreas

• secrete pancreatic amylase

• substrate = starches (carbs)

• products = dextrins & maltose

acinar cells of pancreas

• secrete pancreatic lipase

• substrate = lipids

• products = fatty acids & monoglycerides

acinar cells of pancreas

• secrete proteases

• substrate = proteins & peptides

• product = amino acids

tubule cells of pancreas

• screte NaHCO3

• used to neutralize chyme

intestinal glands

• secrete dipeptidases

• substrate = dipeptides (lipids)

• product = amino acids

intestinal glands

• secrete maltase

• substrate = maltose (carbs)

• product = glucose

intestinal glands

• secrete sucrase

• substrate = sucrose (carbs)

• products = glucose & fructose

intestinal glands

• secrete lactase

• substrate = lactose (carbs)

• products = glucose & galactose

intestinal glands

• secrete dextrinase

• substrate = dextrins (carbs)

• product = maltose

duodenal glands

• secrete mucous

• for protection and neutralization

goblet cells of small intestine

• secrete mucous

• for protection

goblet cells of large intestine

• secrete mucous

• for protection

mouth

digestive juice = saliva

stomach

digestive juice = gastric juice

small intestine

digestive juice = bile, pancreatic juice, intestinal juice