Science Quiz

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Across
  1. 1. sticky fluid
  2. 5. voice box
  3. 6. basic unit of nervous system
  4. 8. carries impulses away from the cell body
  5. 9. trachea
  6. 10. fast action without conscious thinking
  7. 12. lymphatic organs at the back of the throat
Down
  1. 2. largest lymphatic system
  2. 3. basic units of respiratory system
  3. 4. a tiny gap between neuron and dendrite
  4. 7. prevents the backward flow of blood
  5. 11. chief breathing organs of humans