The Respiratory System

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Across
  1. 1. The large airway with cartilage rings
  2. 4. The tiny hairs found in the nose
  3. 6. The gas we don't use and breathe out (no space)
  4. 9. Where gases pass in and out of the bloodstream
  5. 10. Our breathing rate does this as we exercise
  6. 12. The protective bones around our lungs
Down
  1. 2. A flap over the trachea which keeps out food
  2. 3. We need oxygen and ....... to produce energy
  3. 5. The muscle under the lungs used for breathing
  4. 7. The large airways that branches off into the lungs
  5. 8. The gas our cells need for respiration
  6. 11. The useful end product of respiration