1. DIGESTIVE SYSTEM

2. Salivary Glands
Mouth
Esophogus
Liver
Stomach
Pancreas
Large intestine
Small intestine
Rectum
Anus

3. The Digestive System Purpose: How is food digested?
Break down food into small pieces that cells can use.
How is food digested?
Mechanical break down of food into smaller pieces = physical change
Mixing of food
Movement through the digestive tract
Chemical break down of big molecules of food into smaller molecules = chemical change

4. Mouth Physical (Mechanical) digestion – teeth
Chewing – breaks food into small pieces
Chemical digestion – saliva
Enzymes in the saliva begin digestion of carbohydrates.

5. Esophagus Muscular tube
Physically moves food to stomach using waves of muscle contractions called peristalsis.

6. Stomach Produces strong digestive juices.
Chemical Digestion breaks down and dissolves food nutrients.
Digests proteins and fats in the stomach

7. Small Intestine Enzymes continue the chemical digestion of food.
Nutrients are broken down small enough to go through the VILLI of small intestine, and into blood
Digests proteins, fats, and carbohydrates. Digestion Completed Here

8. Pancreas Accessory organ Food does not enter the pancreas
Produces chemicals to help break down macromolecules (big molecules) = chemical difestion

9. Liver
Produces bile to help digest fat = mechanical digestion = physical change
Bile is Stored in the Gallbladder

10. Large Intestine (Colon)
Absorbs dissolved nutrients & water
NO DIGESTION
Forms wastes into solid feces
Physical Change

11. Rectum
Compacts and stores solid waste

12. Anus Opening through which “feces” = solid waste leaves the body
Voluntary Action

13. Salivary Glands
Mouth
Esophogus
Liver
Stomach
Pancreas
Large intestine
Small intestine
Rectum
Anus