Nervous system

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Across
  1. 3. tree-like part of neurons
  2. 7. the chemical on the surface of the component receiving neurotransmitters
  3. 9. the type of synapse that is less likely to firing
  4. 12. part of central nervous system
  5. 13. the neuron type that carries impulses from receptors to CNS
  6. 15. the neuron type that connects the other two types of neurons
  7. 17. the chemical on the surface of previous component of neurotransmission
  8. 19. how an electrical signal called in neurotransmission
Down
  1. 1. the surrounding nervous system
  2. 2. fatty organisation covering the axon
  3. 4. the type of synapse that is more likely to firing
  4. 5. the container of neurotransmitters
  5. 6. the gap for neurotransmitters to cross
  6. 8. component of the division dealing with internal environment
  7. 10. end of axons
  8. 11. the chemical destroys neurotransmitters
  9. 12. the division dealing with external environment
  10. 14. the addition of positive and negative post-synaptic potentials
  11. 16. the division dealing with internal environment
  12. 18. the neuron type that passes the impulse to effectors