1. KEY CONCEPT The digestive system breaks down food into simpler molecules.

2. Several digestive organs work together to break down food.
The digestive system breaks down food into energy cells can use.
After digestion is complete, nutrients are absorbed and transported to all cells.
Undigested materials are eliminated as liquid and solid wastes.
mouth
esophagus
liver
gallbladder
large intestine
small intestine
rectum/anus

3. Digestion begins in the mouth and continues in the stomach.
Mechanical and chemical digestion break down food.
Peristalsis moves food through the organs.
esophagus
muscles contract
muscles relax
food
stomach

4. Digestion of carbohydrates begins in the mouth.
Digestion of proteins occurs in the stomach.
Digestion of fats and sugars occur in the small intestine.

5. Digestion is completed in part of the small intestine.
Most digestion takes place in the duodenum.
The pancreas, liver, and gallbladder aid in digestion.
pancreas helps digest fat and protein
bile from the liver/gallbladder helps digest fats
liver
stomach
bile
chyme
bile
enzymes
gallbladder
pancreas
duodenum