Respiratory System

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Across
  1. 5. A gas that makes up about 4/5 of the air
  2. 6. Muscle between the chest and abdomen
  3. 10. two large spongy organs that are the largest in the respiratory systme
  4. 11. A gas that makes up about 20% of the air the air
  5. 12. Dioxide A waste gas product of the body
  6. 14. To breathe in
  7. 16. One of the openings on the outside of the nose
  8. 19. To move back and forth rapidly
Down
  1. 1. Tiny air sacs in the lungs
  2. 2. The voice box that contains the vocal cords
  3. 3. System The body system that controls breathing
  4. 4. Tube running from the back of the mouth to the lungs
  5. 7. The upper part of the throat connecting to the trachea
  6. 8. A slimy fluid that protects breathing passages
  7. 9. The two main tubes that branch off the trachea
  8. 13. Cavity The inner chamber that cleans and warms air
  9. 15. Small air tubes that branch off the bronchi
  10. 17. To breathe out
  11. 18. Cords Tissue in the voice box vibrate to make sound