The Respiratory System

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Across
  1. 2. Main organ for breathing
  2. 5. Exercising without oxygen
  3. 6. Our primary inhaler
  4. 8. Our main energy source
  5. 10. Another word for our throat
  6. 11. Tubes in our lungs
  7. 13. Muscle that is dome shaped
  8. 14. Exercising using oxygen
Down
  1. 1. Small air sacs where gas exchange occurs
  2. 3. The by-product of anaerobic respiration
  3. 4. The amount of oxygen that needs to be repaid to the body after intense exercise
  4. 7. Muscles inbetween our ribs
  5. 9. Voice box
  6. 12. Wind pipe