Respiration

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