RESPIRATORY SYSTEM

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Across
  1. 4. inflates the lungs, a dome shaped muscular partition.
  2. 6. a colorless, odorless gas produced by respiration
  3. 9. mouth
  4. 12. a set of things working together
  5. 13. covers the opening of the windpipe, at the root of the tongue
  6. 14. amount of air you take into your lungs
  7. 15. slimy substance secreted by membranes for lubrication and protection
Down
  1. 1. pair of organs in respiratory system
  2. 2. the windpipe moves air to and from the lungs
  3. 3. used for swallowing, voice box and holds vocal chords
  4. 5. system associated with breathing
  5. 7. the act of breathing, a single breath
  6. 8. life supporting component
  7. 10. connects the throat to the stomach
  8. 11. hairlike structures found on the surface of cells