Chapter 4 Lesson 4 The Digestive and Excretory

Chapter 4 Lesson 4 The Digestive and Excretory Systems

Digestion • Is the process by which the body breaks down food into smaller components that can be absorbed by the bloodstream. ( Takes about 4 hours )

Digestive System • Is a group of organs that work together to break down foods into substances that your cells can use.

Steps in Digestion • • 1. Mouth – crushing and Grinding 2. Stomach – gastric juices mix with food 3. Small Intestine – Useful material extracted 4. Colon – removal of wastes

How does digestion begin? • Saliva- is a digestive juice produced by the salivary glands in your mouth.

Small Intestine • A coiled tube, about 22 feet long where most of the digestive process takes place.

Liver • The body’s largest gland, secretes a liquid called bile that helps to digest fats. • The liver helps regulate the level of sugar in the blood and breaks down harmful substances such as alcohol. • Bile is made in the liver

Pancreas • Is a gland that helps the small intestine by producing pancreatic juice, a blend of enzymes that breaks down proteins, carbohydrates and fats.

Excretion • Is the process by which the body gets rid of wastes.

Three main functions of the digestive system • Digestion • Absorption • Elimination • The pancreas, liver, and gall bladder help with the absorption of nutrients

Colon • A storage tube for solid wastes.

Caring for your Digestive/Excretory Systems • 1. eat a well balanced diet. • 2. Eat plenty of foods that are low in fat and high in fiber. • 3. Eat at regular times each day. • 4. Drink 8 -10 glasses of water a day. • 5. Take care of your teeth. • 6. Stay Active.

Question of the Day • • • What is the colon? A. small intestine B. pancreas C. appendix D. large intestine