Across
- 2. : Membrane around lungs
- 7. : Gas exhaled from lungs
- 9. : Study of blood
- 12. : Throat passageway
- 16. : Protein that carries oxygen
- 17. : Windpipe carrying air
- 19. : Airways branching into lungs
- 20. : Tiny hairs cleaning airways
- 21. : Small branches of bronchi
- 22. : Circulation in the whole body
- 24. : Process of gas exchange
- 26. : Sac around the heart
- 30. : Voice box
- 31. : Help blood clot
- 32. : Related to the lungs
- 35. : Upper heart chamber
- 36. : Prevents blood backflow
- 37. : Organs where gas exchange happens
- 38. : Sticky fluid trapping dust
- 40. : Pumps blood through the body
Down
- 1. : Movement of air in lungs
- 3. : Carry blood back to the heart
- 4. : Gas inhaled into the lungs
- 5. : Movement of blood
- 6. : Carry oxygen
- 8. : Tiny air sacs in lungs
- 10. : Carry blood away from the heart
- 11. : Chest cavity
- 13. : Fight infections
- 14. : Lower heart chamber
- 15. : Warms and filters air
- 18. : Gas movement in alveoli
- 23. : Smallest blood vessels
- 25. : Muscle that helps breathing
- 27. : Largest artery
- 28. : Brain part controlling breathing
- 29. : Liquid part of blood
- 33. : Heartbeat felt in arteries
- 34. : Divides heart chambers
- 39. : Arteries supplying the heart