1. Digestion is…. The chemical and physical breakdown of large food molecules into smaller soluble ones

2. Human Digestive System TASK: Using this diagram for help, label your digestive system

3. Human Digestive System Appendix Rectum

4. Human Digestive System Appendix Mouth Oesophagus or gullet Liver Gall Bladder Anus Large Intestine Stomach Pancreas Small intestine Rectum

5. Digestion Mechanical digestion Physical breakdown of food (moving bits) Teeth, tongue Chemical digestion (Mostly!) Digestion using chemicals called enzymes Other chemicals that help eg. Bile from liver

6. Digestive Enzymes Amylase (a type of carbohydrase) breaks down carbohydrates like starch into sugars like glucose Proteases break down proteins into amino acids Lipases break down fats (lipids) into fatty acids and glycerol

7. Mouth The start of digestion Food broken down by teeth (chewing) Saliva added to soften food ready to swallow. Saliva contains amylase that breaks down starch (carbohydrate) into sugars.

8. Oesophagus/Gullet A muscular tube (20cm long) Food travels down to the stomach after swallowing. Food travels by a process called PERISTALSIS

9. Stomach A muscular bag Produces proteases enzymes to break down proteins in food. Contains hydrochloric acid to kill microorganisms and help enzymes work Acid does not digest your food for you!

10. AfL: Where would you find protease enzymes? 1-Mouth 2-Oesophagus 3-Stomach

11. AfL: Where would you find protease enzymes? 1-Mouth 2-Oesophagus 3-Stomach

12. AfL: What enzyme is found in saliva? 1-Amylase 2-Protease 3-Lipase

13. AfL: What enzyme is found in saliva? 1-Amylase 2-Protease 3-Lipase

14. AfL: Which enzyme breaks down fats into fatty acids and glycerol? 1-Amylase 2-Protease 3-Lipase

15. AfL: Which enzyme breaks down fats into fatty acids and glycerol? 1-Amylase 2-Protease 3-Lipase

16. Digestion continued… After the stomach… Pancreas produces digestive juices with all three enzymes which go into the first part of the small intestine. At the same time bile is released into the small intestine from the liver (makes bile) and gall bladder (stores bile). This helps to digest fat by breaking it into droplets from large pieces.

17. Small intestine More enzymes added to finish digestion Absorption of digested food takes place here

18. Large intestines Water adsorbed from food into blood here

19. Rectum Where waste faeces (poo) is stored before leaving the body Anus A ring of muscle which prevents faeces from leaving the body until ready http://twig-it.com/mindmap#!/biology/human_body/digestion