DIGESTIVE SYSTEM

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

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

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

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

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

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

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

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

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

Rectum Compacts and stores solid waste

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

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