Breathe Easy, It's Just A Crossword Puzzle!

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Across
  1. 2. These two pipes connect the trachea to the lungs.
  2. 4. All animals need this gas to perform cellular respiration.
  3. 5. You do this when you're tired. It's "contagious!"
  4. 6. when we exhale, we release water, plus this gas.
  5. 8. Tiny air sacs that transfer oxygen into the blood and remove carbon dioxide from the blood.
  6. 10. These fill up when you inhale. The main organs of breathing.
  7. 12. Scientific name for the "windpipe"
  8. 13. The scientific word for "breathing in".
  9. 15. You do this when something irritates your nose.
Down
  1. 1. Substance on your red blood cells that attaches to oxygen.
  2. 3. Tiny pipes that carry air to all parts of the lungs.
  3. 7. This prevents you from choking when you swallow.
  4. 9. You should not breathe through this opening, because the air will NOT be warmed, cleaned or moistened.
  5. 11. A large, parachute-shaped muscle that controls breathing.
  6. 14. The scientific word for breathing out.