DIGESTIVE SYSTEM

MoutMouthh EsophogusEsophogus

LiveLiverr

AnusAnus

StomacStomachhPancreasPancreasLarge Large intestineintestineSmallSmall

intestineintestineRectumRectum

Salivary GlandsSalivary Glands

The Digestive System

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

Purpose:• Break down food into small pieces that

cells can use.

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

MoutMouthh EsophogusEsophogus

LiveLiverr

AnusAnus

StomacStomachhPancreasPancreasLarge Large intestineintestineSmallSmall

intestineintestineRectumRectum

Salivary GlandsSalivary Glands