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1. Respiratory
and
digestive
systems

2. Index:
Page
• Respiratory system 3
• Digestive system 10
• Questions 23

3. The respiratory system
Air

4. Why do we breathe?Because we need oxygen.

5. Oxygen is in the air.Living things need oxygen to live.

6. We breathe in air through the nose and mouth

7. The air travels to the lungs.
Nose
Lungs
Mouth
The air travels to the lungs.

8. OxygenOxygen
When we breathe in
Air
our lungs take in oxygen.

9. Then, our heart pumps the oxygen around our body.

11. Digestive system.

12. Digestive system.

13. Why do we need to eat?Because food gives us energy.

14. We need food to grow.

15. All living things need food to grow.

16. What happens when you eat food?

17. Digestion begins in the mouth.
Our teeth chew the food to break it down into small pieces

18. Then, the food goes through the esophagus,

19. the stomach,

20. the small intestine,

21. and the large intestine.

23. Remember:
Mouth
esophagus
Stomach
Small instestine
Large instestine

24. Now, answer these questions with your partner.

25. Why do we breathe?Because we need oxygen.

26. and breathe out carbon dioxide
oxygen
CO2
We breathe in oxygen,

27. Name the organs
of the respiratory system.
Nose
Lungs
Mouth

28. Why do we need to eat?Because food gives us energy.

29. We need food to grow.

30. Remember:
• Mouth
• Esophagus
• Stomach
• Small intestine
• Large intestine

31. Can the name the organs of the digestive system?
Mouth
esophagus
Stomach
Small instestine
Large instestine