DIGESTIVE TRACT

Organ

Enzymes Present

What Happens Here

mouth

amylase (in saliva)

mechanical digestion of all food (teeth chewing & grinding)
chemical digestion of carbohydrates begins

esophagus

none

food passes from mouth through the esophagus to the stomach

stomach

pepsin
gastric juice
HCl *

mechanical digestion of food (churning of stomach walls)
chemical digestion of proteins begins

small intestine

pancreatic juice
intestinal juice
bile*

chemical digestion of carbohydrates, proteins, & lipids continues & is completed
the small, soluble nutrients (sugars, amino acids, fatty acids) are absorbed

large intestine

none

water is absorbed from undigestible wastes (feces)

rectum

none

feces are temporarily stored

anus

none

feces are eliminated (egested) from the body

Accessory Organ

What it does

tongue

helps mix food with saliva, assists in swallowing

salivary glands

produces saliva (which contain the enxymes amylase)
amylase chemically digests carbohydrates

liver

produces bile
bile EMULSIFIES fats (lipids)

gall bladder

stores bile, then releases into small intestine

pancreas

produces pancreatic juice, which is a mixture of digestive enzymes
pancreatic juice ends up in the small intestine where it assists in completing the digestion of proteins, lipids, & carbohydrates