Respiratory and Nervous System Crossword

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Across
  1. 5. Three protective membranes
  2. 6. Voice Box
  3. 10. space between lungs
  4. 12. Junction between the axon
  5. 13. largest organ in the body
  6. 14. specialized cell
  7. 15. Signals to organisms
Down
  1. 1. used to measure respiratory volumes
  2. 2. Tiny sacs of lung tissue
  3. 3. Major role in breathing
  4. 4. Neuron extension
  5. 7. Passageway for food
  6. 8. Two spongy organs
  7. 9. Branch like parts
  8. 11. Windpipe