Crossword

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Across
  1. 4. regulate fear
  2. 5. system is responsible for the "fight-or-flight" response?
  3. 7. avoid challenges
  4. 9. eliminate a threat
  5. 10. Nervous System
  6. 12. is the primary purpose of attack behavior?
Down
  1. 1. System
  2. 2. nervous system
  3. 3. Nervous System
  4. 6. eliminate a treat
  5. 8. System
  6. 11. release serotonin