Respiration2

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