Mr Nervous

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Across
  1. 2. The structure which converts a stimulus to an impulse.
  2. 3. The reflex action that regulates the amount of light entering the eye.
  3. 7. A neural pathway along which nerve impulses are transmitted from a receptor to an effector without involving conscious control by the brain.
  4. 11. The region of the central nervous system where blood capillaries, relay neurones and synapses can be found.
  5. 12. Nerve impulses transmitted by the sensory neurones enter the central nervous system via this structure.
  6. 13. A long filament of cytoplasm that runs from the cell body to the terminal branches and transmits nerve impulses over long distances.
  7. 15. A nearly instantaneous response to a specific stimulus without any conscious control.
  8. 16. The neurone which transmits nerve impulse from the central nervous system to effectors to effect a response.
  9. 18. The way all the organs and systems of the body are made to work efficiently together.
  10. 19. The reflex action that adjusts the curvature of the eye lens in order to produce a focused image on the retina.
  11. 22. The reflex action involving body structures below the neck.
Down
  1. 1. The nervous system which consists of the nerve fibres connecting the central nervous system to all effectors and receptors throughout the body.
  2. 4. Nerve impulses transmitted by the motor neurones leave the central nervous system via this structure.
  3. 5. The neurone which transmits nerve impulses from receptors to the central nervous system.
  4. 6. The chemical substance which is responsible for propagation of nerve impulses through the gap between neurone A's axon terminals and neurone B's dendrites.
  5. 8. The neurone which transmits nerve impulse from sensory neurone to motor neurone
  6. 9. Branches from the cell body which receives nerve impulse from a receptor or another axon terminal towards cell body.
  7. 10. The reflex action involving body structures above the neck.
  8. 14. The number of components that make up a reflex arc.
  9. 17. An action which is decided by the brain via the effector.
  10. 20. The nervous system which consists of both the brain and the spinal cord.
  11. 21. The basic units of the nervous system which transmits nerve impulses rapidly to precise target cells.