Kaupapa: 03 / 27 Monday Define “digestion” Describe the process of digestion in the mouth

Do you remember? Describe the food test for proteins Describe the food test for starch Describe the food test for glucose Compare and contrast starch and glucose

Digestive System

What is digestion? Why do we need to digest?

Digestion Digestion is breaking down food into smaller parts in order to extract and absorb the nutrients within. There are two types of digestion: Physical digestion Chemical digestion (by Enzymes)

Digestive System Teeth Tongue Salivary Glands Oesophagus Liver Gall Bladder Stomach Pancreas Small Intestine Large Intestine Rectum Anus

Part One: MOUTH What happens to the food in the mouth?

Chewing (Physical Digestion)

Human Teeth a) Incisor b) Canine c) Molar d) Premolar

Canine Incisor Molar for ripping and tearing for cutting food for crushing and grinding

Crazy Canines ! Walrus

Crazy Canines ! Sabre Tooth Tiger (extinct)

What else happens in the mounth? Saliva mixes with food

Enzymes in Action

Saliva breaks down starch (Chemical digestion) Starch Glucose

Part One: MOUTH The food is physically digested by the _______. The food is also mixed with _______ which enables swallowing. It also contains _______ (carbohydrates) which chemically digest ________ into __________.

Demo – Starch & Saliva

Weet-Bix Challenge

What have we learnt today? What is digestion? Describe two things that happen to the food in the mouth Why do we need saliva?