The human nervous system

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Across
  1. 3. parts of the body that respond to a stimulus; muscles and glands are are effectors
  2. 4. changes in the environment that can be detected by organisms
  3. 5. a very small vacuole
  4. 6. a long, thin, fibre of cytoplasm that extends from the cell body of a neurone
  5. 7. short fibres of cytoplasm in a neurone
  6. 10. ensuring that actions of different parts of the body work together
  7. 12. an electrical signal that passes rapidly along an axon
  8. 14. a chemical stored in vesicles at the end of neurones, which can be released to diffuse across the synaptic cleef and set up an electrical impulse in the next neurone
  9. 15. a cell that is secialised for conducting electrical impulses rapidly
Down
  1. 1. a neurone that transmits electrical impulses from the CNS to an effector
  2. 2. a means of automatically and rapidly integrating and coordinating stimuli with the responses of effectors
  3. 8. cells or groups of cells that detect stimuli
  4. 9. a tiny gap between two neurones, at a synapse
  5. 11. a group of neurone axons lying together
  6. 13. a junction between two neurones