1. Lesson: Digestive System

2. All living things are made up of cells.
Food has to be broken down before it is transported to every cell.

3. Our digestive system breaks down food and absorbs it so it can be transported around our bodies.

4. Parts of our digestive system
mouth
oesophagus
liver
stomach
pancreas
large intestine
small intestine

5. Parts of our digestive system
mouth
where food is chewed and mixed with saliva

6. Parts of our digestive system
oesophagus
the tube that carries food to the stomach

7. Parts of our digestive system
stomach
stores food and mixes it with digestive juices

8. Parts of our digestive system
small intestine
the tube where broken down food is absorbed into the blood

9. Parts of our digestive system
large intestine
passes water back into the blood leaving solid waste

10. Parts of our digestive system
pancreas
makes
digestive enzymes

11. Parts of our digestive system
liver
makes bile which helps to break down fats

12. What is the function of each part?
mouth
oesophagus
liver
stomach
pancreas
large intestine
small intestine

13. Nutrition involves 5 stages.
Ingestion
Digestion
Absorption
Assimilation
Egestion

14. Teeth
break down food into smaller pieces
(physical digestion)

15. There are four types of teeth.
Upper or maxillary teeth
Lower or mandibular teeth
Incisors
Canines
Premolars
Molars

16. Molars
Premolars
Incisors
Canines

17. Teeth
Incisors
Canines
Premolars
Molars

18. Teeth
Incisors –
cut food
Canines –
tear food
Premolars –
grind food
Molars –
grind food

19. Review Questions:
Label each part. E A F B C G D

20. Question to think about
Enzymes are involved in chemical digestion.
What do you think this means?
Enzymes act here!