The Human Nervous System

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Across
  1. 5. The gap between two neurones
  2. 7. A brief current/ pulse of electrical energy
  3. 10. Sensory, relay and motor are all examples
  4. 11. A change in the environment that is detected by a sense organ
  5. 12. The number of types of neurones in the human nervous system
  6. 13. the reaction of an organism to a particular stimulus
  7. 15. The ___ nervous system contains nerves that arise from the brain or spinal cord and go to all the organs in the body
  8. 17. This is where the sensory neurones can be found
  9. 18. The ___ nervous system contains the brain and spinal cord
  10. 19. A fatty white substance that surrounds the axon of some nerve cells forming an electrically insulating layer
  11. 20. ___ actions happen automatically without conscious control
  12. 22. A ___ neurone transits impulses away from the central nervous system to effectors
Down
  1. 1. The effector can be a muscle or ___
  2. 2. A short branched extension of a nerve cell
  3. 3. A chemical substance which is released at the end of a nerve fibre by the arrival of a nerve impulse
  4. 4. The impulse goes from the dendrite to the ___
  5. 6. A ___ neurone transmits impulses from receptors to the central nervous system
  6. 8. A bundle of neurones which pass from the CNS to a certain part of the body
  7. 9. ___ actions are when the brain makes a decision under conscious control
  8. 14. The organs or cells that bring about responses to a stimulus
  9. 16. The only neurone located in the central nervous system
  10. 21. Cells or organs that are sensitive to a stimulus