Across
- 1. the first part of the airway where inhaled air travels
- 4. a product of respiration
- 5. the purpose for respiration is to release this
- 7. the process that moves gases in and out of the blood
- 10. alternative entry point for inhalation
- 11. the waste product of respiration
- 13. this cage-like structure moves in the chest when breathing
- 15. the watery part of blood that carries carbon dioxide
- 18. the system that involves breathing
- 19. a breath out
- 20. a tissue type where respiration occurs continually.
Down
- 2. small air sac in the lungs
- 3. Substance in red blood cells which carries oxygen
- 6. oxygen burns this to release energy
- 8. a breath in
- 9. little muscles between the ribs that contract
- 11. what are the alveoli covered with?
- 12. sheet of muscle that contracts to expand chest cavity
- 14. entry point of air into body
- 16. divides into two, one branch to each lung
- 17. needs to get into bloodstream to be carried to cells