The System

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Across
  1. 3. The system that we presented
  2. 5. The smaller of the two entry points for air
  3. 7. Where the transfer of oxygen and carbon dioxide occur
  4. 8. Largest of the two entry points for air
  5. 9. This muscle causes the Lungs to contract and expand
  6. 10. Term referred to when your blood is filled with oxygen
  7. 11. The small direct passageways into the lungs
  8. 12. A tube that is commonly know as the windpipe
Down
  1. 1. What oxygen is converted to in the cycle
  2. 2. How you start the cycle
  3. 4. Tiny grape-like sacs
  4. 6. Tubular structure that allows air to pass to the lungs
  5. 7. Commonly known as the voice box