The nervous system

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Across
  1. 3. an inhibitory neurotransmitter
  2. 4. a disease caused by imbalance between excitatory and inhibitory neurotransmitters.
  3. 6. the addition of + & - post synaptic potentials
  4. 12. fatty covering on the axon of some neutrons to speed up transmission
  5. 13. communication within neutrons is ...
  6. 15. the type of neutron that communicates with effectors
  7. 17. the sacs that carry neurotransmitter
  8. 18. potential the electrical signal sent down the axon
  9. 20. the genetic make up of an organism
Down
  1. 1. the body of a neutron
  2. 2. makes the firing of receiving neutron less likely
  3. 5. the 'rest and digest' part of the nervous system
  4. 7. the part of the PNS that controls fight or flight response
  5. 8. an excitatory neurotransmitter
  6. 9. communication between neutrons is ...
  7. 10. the physical manifestation of the genetic makeup of an organism
  8. 11. the gap between two neutrons
  9. 14. makes firing of receiving neutron more likely
  10. 16. lobe that controls vision
  11. 19. the genetic code for an organism