Nervous system

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Across
  1. 3. muscles or glands that respond to impulses
  2. 6. an insulating phospholipid layer that surrounds the axons of neurons
  3. 8. long nerve fiber that conducts away from the cell body of the neuron
  4. 9. message that travels from the dendrites of a neuron to the axon
  5. 11. receives information about changes in the environment
  6. 12. the folded outer surface of the cerebrum
  7. 14. A tiny gap where two neurons meet
  8. 15. Cells that support, insulate, and protect neurons
  9. 17. links brain to rest of body
  10. 19. serves the internal organs of the body
  11. 20. A bundle of neurons
Down
  1. 1. the extensions of a neuron that receives messages and conducts impulses toward the cell
  2. 2. the brain stem
  3. 4. involuntary response to a stimulus
  4. 5. Process by which ATP is used to move sodium ions out of the cell and potassium ions back into the cell
  5. 7. helps control muscle coordination and balance
  6. 10. brain, spinal cord, and network of nerves throughout your body.
  7. 13. natural neurotransmitters linked to pain control
  8. 16. the command center of the body.
  9. 18. the largest part of the brain