Respiratory system

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Across
  1. 3. Breathing muscle
  2. 5. Breathing out
  3. 7. Lower heart chambers
  4. 9. Airway tube
  5. 12. Circulation Heart–body circulation
  6. 13. Circulation Heart–lung circulation
  7. 16. Flap covering airway
  8. 18. Upper heart chambers
  9. 20. Tiny nose hairs
  10. 21. Large air tubes
  11. 23. Help clot blood
  12. 24. Respiration Gas exchange in cells
  13. 25. Windpipe
  14. 27. Tiny air sacs in lungs
  15. 30. Prevents backflow
  16. 31. Gas needed for life
  17. 32. Small air tubes
  18. 34. Carry blood to heart
  19. 35. Close with heartbeat
  20. 37. Breathing process
  21. 38. System Breathing system
Down
  1. 1. Body fluid
  2. 2. Cava Main vein to heart
  3. 4. Throat passage
  4. 6. Carry blood away
  5. 8. Breathing in
  6. 10. Pumps blood
  7. 11. Entry of air
  8. 14. Blood Cells Fight infection
  9. 15. Respiration Gas exchange in lungs
  10. 17. Liquid part of blood
  11. 19. Voice box
  12. 22. Oxygen-carrying pigment
  13. 23. Beat of arteries
  14. 26. Dioxide Gas we exhale
  15. 28. Organs for breathing
  16. 29. Circulation Two blood loops
  17. 33. Smallest blood vessels
  18. 36. Largest artery