TURN IN FOOD PARTICLE STORY HW Science Starter TURN IN FOOD PARTICLE STORY HW What is the difference between mechanical and chemical digestion? What is the difference between canal organs and accessory organs? Why do you think we need accessory organs?

Today’s Agenda Science Starter Types of Enzymes Digest This! Lab Digestive System Model Exit Quiz

IMPORTANT DIGESTIVE ENZYMES Carbohydrates Amylase- breaks down starch in the mouth Maltase/Amylase- breaks down starch in the small intestine Protein Pepsin- cuts up protein in the small intestine (made in the pancreas) IMPORTANT DIGESTIVE ENZYMES Fats Bile Salts- produced in the liver, digests fats in the small intestine Lipase- Breaks down fat further in small intestine (made in the pancreas) Nucleic Acids Nuclease- breaks down RNA/DNA in small intestine

Digest This! Lab Complete all 5 activities by the end of today’s class You will need to keep time for several different activities, make sure you watch the clock! Beakers and vinegar are located at the front table Food items are located at the front table Clean up lab area and place all dishes at the back sink

Digestive System Model Labels/Key- All of the digestive system organs present in the model should be labeled (arrows or color key) and a short description of the function provided (i.e. Esophagus moves food by peristalsis) Type of Digestion- Along with each description should include whether this section of the digestive system uses mechanical, chemical, or both types of digestion. (Be sure to explain what this means, i.e. mouth completes mechanical digestion by using the teeth and chemical digestion by using the saliva) Enzymes- For the digestive organs that complete chemical digestion be sure to list any enzymes that are present.

Exit Quiz Why does our body use both mechanical and chemical digestion? What is the difference between water and the saliva in our mouth? Where in the body does chemical and mechanical digestion work?