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Across
  1. 2. : Reflex to expel irritants from nasal passages
  2. 6. : Difference in gas concentration driving exchange
  3. 8. : Fluid reducing friction around heart
  4. 10. : Groups of tiny air sacs in lungs
  5. 12. : Curved portion of the aorta
  6. 14. : Blood route between heart and the body
  7. 18. : Small tubes leading to alveoli
  8. 20. : Process of moving air in and out of lungs
  9. 21. : Number of heartbeats per minute
  10. 22. : Blood rich in oxygen
  11. 28. : Brain area controlling breathing rate
  12. 29. : Role of circulatory system
  13. 31. : Total amount of blood in the body
  14. 32. : Process to stop blood loss
  15. 35. : Passages connecting trachea to lungs
  16. 38. : Movement of oxygen and carbon dioxide in alveoli
  17. 39. : Noise made by closing valves
  18. 40. : Small branch of an artery
Down
  1. 1. : Thin barrier for gas exchange
  2. 3. : Dome-shaped muscle for breathing
  3. 4. : Blood route between heart and lungs
  4. 5. : Tiny vessels where gases switch
  5. 7. : To push air out of the lungs
  6. 9. : Series of passages for airflow
  7. 11. : Sections of each lung
  8. 13. : Reflex to clear airway irritants
  9. 15. : Tubes that carry blood throughout body
  10. 16. : Force that moves air during breathing
  11. 17. : Blood pumped per heartbeat
  12. 19. : Pathway of blood between lungs and heart
  13. 23. : To draw air into the lungs
  14. 24. : Mechanical act of breathing
  15. 25. : Small branch of a vein
  16. 26. : Vessels returning blood from heart muscle
  17. 27. : Another term for circulatory system
  18. 30. : Mass that stops bleeding
  19. 33. : Sound production using vocal cords
  20. 34. : Blood low in oxygen
  21. 36. : Trap dust and particles in nose
  22. 37. : Amount of blood heart pumps per minute