3. Components of the digestive system The alimentary canal Digestive glands Human digestive system The digestive system of a rat Peristalsis The structure and functions of a villus

4. a tube from mouth to anus The digestive system in mammals Alimentary canal Digestive glands they produce enzymes for digestion

5. The alimentary canal oesophagus stomach small intestine large intestine rectum anus

6. Digestive glands salivary glands gastric gland liver pancreas intestinal gland saliva bile gastric juice pancreatic juice intestinal juice

7. Human digestive system

8. Digestive system of a rat large intestinesmall intestine liverstomach

9. Peristalsis muscle in front of the food bolus relaxes muscle behind the food bolus contracts  food bolus is pushed along the gut The rhythmic contraction and relaxation of the muscles of the gut wall to move food along the alimentary canal

10. transports fats and glucose increase surface area for absorption one cell thick with blood capillaries and a lacteal Structure and function of a villus villus muscle wall lacteal

11. Summary The digestive system is the system of organs that are involved in the process of digestion is made up of the alimentary canal and associated glands Movement of food along the alimentary canal by peristalsis Absorption of digested food by villi