Across
- 2. a fluid that delivers necessary nutrients to cells
- 4. a condition where the airways swell and fill with mucus
- 7. bones that protect the lungs and heart
- 9. tiny sacs that allow for rapid gaseous exchanges
- 11. a vessel leading from the heart to the lungs
- 13. is emitted when we exhale
- 16. the main passageway into the lungs leading from the trachea
- 18. organ used to pump blood around the body
- 22. a group of alveoli
- 24. also is known as the throat
- 25. a flap in the throat that stops food from entering the windpipe
- 26. a vessel leading from the lungs to the heart
- 28. hairs that line the nostrils to keep mucus out
- 29. the act of breathing in
Down
- 1. pipe that delivers air to the lungs
- 3. the organ used to breathe
- 5. a slimy substance secreted for lubrication or protection
- 6. connects the bronchioles to the alveoli
- 8. the group of muscles that run between the ribs
- 10. does not contain oxygen
- 12. also known as the voice box
- 14. the act of breathing out
- 15. a muscle that contracts continually when you inhale and exhale
- 17. the branches that divide from the bronchus
- 19. two external openings of the nasal cavity
- 20. a large air-filled space in the middle of the face
- 21. the smallest blood vessels in the body
- 23. contains oxygen
- 24. cushions the lungs from rubbing against the ribs
- 27. the gas we need to survive