1. 200 pt 300 pt 400 pt 500 pt 100 pt 200 pt 300 pt 400 pt 500 pt 100 pt 200pt 300 pt 400 pt 500 pt 100 pt 200 pt 300 pt 400 pt 500 pt 100 pt 200 pt 300 pt 400 pt 500 pt 100 pt Respiratory System organs Respiratory system operation Circulatory System organs Blood Mixed up Systems

2. The bones that protect the lungs.

3. Ribs

4. The dome-shaped sheet of muscle that forms the bottom of the chest cavity.

5. Diaphram

6. The air passage in your throat that leads to the lungs.

7. Trachea

8. The smallest and thinnest air tubes in the lungs.

9. Bronchioles

10. A membrane that encloses each of the lungs.

11. Pleura

12. The colorless gas that you breathe out as waste.

13. Carbon Dioxide

14. To breathe out.

15. Exhale

16. To breathe in.

17. Inhale

18. An explosive and sudden release of air through the mouth.

19. Cough

20. When you breath in through your nose the air travels through this and continue on towards the pharynx.

21. Nasal Passage

22. This is the organ in your body, about the size of your fist, that pumps blood throughout the body.

23. Heart

24. These are the lower chambers of the heart

25. Ventricles

26. This is the main and largest artery in the body.

27. Aorta

28. These are the upper chambers in the heart.

29. Atriums

30. This vein takes the blood to the lungs for oxygen.

31. Pulmonary Vein

32. This is the liquid that carries oxygen throughout your body.

33. Blood

34. This is the clear, liquid part of the blood that holds proteins, digested food, wastes, and other substances,

35. Plasma

36. These are the cells which fight diseases in the body.

37. White Blood Cells

38. These are the tiny blood cells that stop bleeding.

39. Platelets

40. These are the tiny blood vessels that connect arteries and veins.

41. Capillaries

42. This counts the heartbeats in a minute’s time.

43. Pulse

44. The tiny hairs inside your air tubes that keep dirt away form your lungs.

45. Cilia

46. The slimy liquid inside your nose and lungs to help trap dirt from the air.

47. Mucus

48. The flap of cartilage behind your tongue.

49. Epiglottis

50. Separates the left atrium and the left ventricle.

51. The Mitral Valve