Across
- 1. slime that lines air passages
- 5. to breathe in
- 6. moist membrane surrounding the lungs
- 7. acid created by CO2 in water
- 9. to breathe out
- 10. organs of respiration in humans
- 11. muscles between the ribs
- 13. opening to the nose
- 14. gas needed for cell respiration
- 15. tiny air sacs in lungs
- 16. branches of the bronchi
- 19. tissue flap that keeps food out of windpipe
- 21. device to measure lung capacity
- 23. windpipe
- 25. chamber inside the nose, nasal ___
- 26. the two main branches of the trachea
- 28. part of brain that regulates breathing rate
- 29. gas exchange between alveoli and blood, ___ resp.
Down
- 2. tissue polyp that hangs down from back of your throat
- 3. tiny "hairs" that move mucus out of lungs
- 4. makes up the majority of air
- 6. type of capillaries that line the alveoli
- 7. "burning" food with oxygen to get energy, ___ resp.
- 8. cell that detects chemicals in blood
- 12. organs of respiration in fish
- 17. sheet of muscle at bottom of the chest cavity
- 18. energy currency of the cell
- 20. amount of a normal breath of air, ___ volume
- 22. gas exchange between blood and cells, ___ resp.
- 24. all the air your lungs can hold, ___ capacity
- 27. gas that triggers breathing rate, ___ dioxide