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