Across
- 3. identical twins
- 6. small gap between nerve cells
- 7. the oldest part of the brain
- 9. trouble falling or staying asleep
- 14. changing physical energy into neural signals
- 16. key role is fear and anger responses
- 17. traits passed through genetics
Down
- 1. fraternal twins
- 2. affects mood,sleep,appetite, and, well being
- 4. a hormone linked to love.
- 5. a cell that transmits nerve impulses
- 8. chemicals make neurons less likely to fire
- 10. hormone that regulates sleep
- 11. minimum stimulation needed to trigger neuron
- 12. a section of the nerve cell
- 13. a stimulant
- 15. determines pitch