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