The Nervous System

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Across
  1. 3. is the membrane that receives a signal from the presynaptic cell and responds via depolarisation or hyperpolarization
  2. 5. receive signals that trigger an electrical signal, by regulating the activity of ion channels
  3. 9. fundamental units of the brain and nervous system
  4. 10. a small gap in the myelin sheath of a myelinated nerve fiber
  5. 13. a whitish fiber or bundle of fibers that transmits impulses of sensation to the brain or spinal cord
  6. 15. allows electrical impulses to transmit quickly and efficiently along the nerve cells.
  7. 18. are the main glial cells of the peripheral nervous system which wrap around axons of motor and sensory neurons to form the myelin sheath
  8. 20. a large granular body found in neurons
  9. 21. a chemical substance that is released at the end of a nerve fiber by the arrival of a nerve impulse and, by diffusing across the synapse or junction
  10. 23. a sensory receptor which receives stimuli from within the body
  11. 24. system that consists of the brain and spinal cord
Down
  1. 1. a structure containing a number of nerve cell bodies
  2. 2. system that lies outside the brain and spinal cord
  3. 4. a thing or event that evokes a specific functional reaction in an organ or tissue
  4. 6. sensory neurons that carry nerve impulses from sensory stimuli towards the central nervous system and brain
  5. 7. the long thread like part of a nerve cell
  6. 8. are small swellings that are found at the terminal ends of axons.
  7. 11. also called neuronal junction, the site of transmission of electric nerve impulses between two nerve cells or between a neuron and a gland or muscle cell
  8. 12. system responsible for control of the bodily functions
  9. 14. the nucleus-containing central part of a neuron exclusive of its axons and dendrites
  10. 16. motor neurons that carry neural impulses away from the central nervous system and towards muscles to cause movement
  11. 17. do not have motor or sensory functions; they just act to pass on information
  12. 19. neurons that are associated with skeletal or striated muscle fibers and influence voluntary movements of the body
  13. 21. cells that hold nerve cells in place and help them work the way they should
  14. 22. a short branched extension of a nerve cell