Across
- 3. without oxygen
- 7. in the presence of oxygen
- 10. gas is able to pass through it
- 11. stops food from entering trachea
- 14. traches divides into two of them
- 17. wrapped around the alveoli
- 21. food is broken down to release energy
- 23. tiny air sacs
- 24. breathe in
- 25. gas organisms need
- 26. gas that must be removed
- 27. breathe out
Down
- 1. diaphragm relaxes, moves up
- 2. large muscle beneath the lungs
- 4. moistens air, traps pathogens
- 5. gases entering and leaving an organism
- 6. top part of the trachea
- 8. diaphragm contracts, moves down
- 9. smaller branches of bronchi
- 12. main nutrient used in respiration
- 13. chest
- 15. muscles between ribs
- 16. make sounds when air passes over them
- 18. lets you breathe while eating
- 19. produced by anaerobic respiration
- 20. move mucus to the throat to be swallowed
- 22. tube that connects the mouth/nose with lungs