Respiratory System

Hint Words: sponges, 16, diaphragm, downwards, breathe, carbon dioxide, outwards, lungs, oxygen, ribs, out, body, windpipe, blood vessels, chest, nose, heart, smaller, contracts, bigger

1. The human respiratory system has two . lungs

2. Air tubes lead from the mouth and to the lungs. nose

3. Muscles in the help air move in and out of the lungs. chest

4. We use our for breathing. lungs

5. We need to to stay alive. breathe

6. The lungs are in the . chest

7. The lungs are protected by the . ribs

8. The lungs are like stretchy that fill with air. sponges

9. We need to live. oxygen

10. Oxygen from the air moves into the in the lungs. blood vessels

11. Blood carries the oxygen to the . heart

12. The blood takes oxygen to the other parts of the . body

13. The body makes as it uses oxygen. carbon dioxide

14. Blood carries carbon dioxide back to the . lungs

15. We breathe out gas. carbon dioxide

16. Air leaves the body through the or mouth. nose

17. Air from the lungs moves up the . windpipe

18. The muscle relaxes and moves upwards when we breathe out. diaphragm

19. The ribs move and inwards when we breathe out. downwards

20. The chest gets when we breathe out. smaller

21. Air is pushed of the lungs when we breathe out. out

22. When we breathe in, the diaphragm and moves down. contracts

23. The ribs move upwards and when we breathe in. outwards

24. The chest gets and the lungs fill with air. bigger

25. We breathe in and out about times every minute. 16