Respiratory System

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Across
  1. 2. Gas that we breathe in and deliver to our cells
  2. 4. The state of matter of both oxygen and carbon dioxide in the lungs
  3. 6. Tiny air sacs where oxygen enters the blood
  4. 11. The two tubes that branch off the trachea into the lungs
  5. 12. Bones that protect the lungs and heart
  6. 14. Sticky substance that traps dust and germs in air passages
  7. 16. Smallest blood vessels; wrap around alveoli
  8. 18. Muscle under the lungs that helps with breathing
Down
  1. 1. The process of breathing air out of the lungs
  2. 3. The double-layered membrane surrounding the lungs
  3. 5. Waste gas produced by cells and removed by the lungs
  4. 7. Organs where oxygen and carbon dioxide are exchanged
  5. 8. The act of taking air into the lungs
  6. 9. Windpipe that connects the throat to the lungs
  7. 10. A general term for the path that air follows into the lungs
  8. 13. The main entry point for air into the respiratory system
  9. 15. Connects nose/mouth to the larynx
  10. 17. The voice box; air passes through this after the pharynx