THE RESPIRATORY SYSTEM

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Across
  1. 2. To breathe in
  2. 4. Muscle that helps breathe
  3. 6. Here there are our vocal cords
  4. 9. Air tubes smaller than bronchi inside the lungs
  5. 10. It's essential for life
  6. 12. To breathe out
  7. 15. It's a waste gas
  8. 16. Spasms of the diaphragm
Down
  1. 1. The passage by which air reaches a person's lungs
  2. 3. Group of tissue
  3. 5. Group of organs
  4. 7. It protects the lungs
  5. 8. It flows through our veins and arteries
  6. 9. Trachea divides into two air tubes called..
  7. 11. It's a tube that delivers air from your mouth and nose to the trachea
  8. 13. Where the exchange of oxygen and carbon dioxide takes place
  9. 14. Hollow areas