The respiratory system

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Across
  1. 2. a thin skeletal muscle that sits in the chest
  2. 3. An passage way for air
  3. 5. a long stick like figure
  4. 9. smallest and most numerous of vessels
  5. 10. what you use to smell
  6. 11. we need it to breath
Down
  1. 1. air passages inside the lungs that branch alveoli the lungs and the blood mix oxygen and carbon
  2. 4. An air-filled organ
  3. 6. a chemical compound
  4. 7. the net moving of anything
  5. 8. we have 24 of them