Respiratory System

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Across
  1. 3. large, fat muscle bottom chest cavity helps breathing
  2. 4. organs exchange oxygen with water
  3. 6. iron containing protein
  4. 9. voice box
  5. 10. ions enzyme change carbon dioxide into water
  6. 13. breathing in
  7. 14. two spongy organs
Down
  1. 1. liquid part of blood
  2. 2. smallest blood vessel
  3. 5. breathing tubes located in abdomen
  4. 7. breathing out
  5. 8. throat
  6. 10. smaller tubular branches of airway
  7. 11. flap tissue, prevents food from entering
  8. 12. windpipe