The Human Nervous System

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