The Respiratory System

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Across
  1. 4. The large airway with cartilage rings
  2. 5. The protective bones around our lungs
  3. 6. A flap over the trachea to keep food out
  4. 7. The muscle under the lungs used for breathing
  5. 9. The large airways which branch off into the lungs
  6. 10. The useful end product of respiration
  7. 11. Our breathing rate does this as we exercise
  8. 12. We need oxygen and ....... to make energy
Down
  1. 1. The tiny hairs found in the nose
  2. 2. The gas our cells need for respiration
  3. 3. The gas we can't use and breathe out
  4. 8. Where in the lungs gases pass in and out of the bloodstream