Neuron Crossword

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Across
  1. 6. support cells are grouped together.
  2. 10. electrochemical change in a neuron to send a signal.
  3. 13. involuntary and controls smooth and cardiac muscles and glands.
  4. 14. bundles of nerve fibers in the PNS.
  5. 20. fibers that extend from the cell body.
  6. 22. cells line cavities of the brain and spinal cord.
  7. 25. brain and spinal cord.
  8. 26. clusters of cell bodies in the CNS.
  9. 29. membrane permeability changes again, becoming impermeable to sodium ions and permeable to potassium ions, which rapidly diffuse out of the neuron.
  10. 30. spiderlike phagocytes that monitor health of nearby neurons and dispose of debris.
  11. 32. cells form myelin sheath around nerve fibers.
  12. 34. cells protect and cushion neuron cell bodies.
  13. 35. bundles of nerve fibers in the CNS.
  14. 38. functional junction between nerves where a nerve impulse is transmitted.
  15. 40. division of nerve fibers that carry impulses away from the central nervous system organs to effector organs.
  16. 41. ability to transmit the impulse to other neurons, muscles, or glands.
Down
  1. 1. nerves carry impulses to and from the spinal cord.
  2. 2. stress response
  3. 3. activates muscles or glands.
  4. 4. nerves carry impulses to and from the brain.
  5. 5. plasma membrane that is inactive.
  6. 7. ability to respond to a stimulus and convert it to a nerve impulse.
  7. 8. collections of cell bodies outside the CNS in the PNS.
  8. 9. restores initial conditions of sodium and potassium ions using ATP.
  9. 11. are nerve cells that are specialized to transmit impulses.
  10. 12. nervous system processes and interprets sensory input and decides whether action is needed.
  11. 15. voluntary and controls skeletal muscles.
  12. 16. wrap around nerve fibers in the central nervous system and produce myelin sheaths.
  13. 17. relaxation response
  14. 18. division of nerve fibers that carry information to the central nervous system.
  15. 19. white, fatty material covering axons; protects and insulates fibers and speeds nerve impulse transmission.
  16. 21. cleft gap between axon terminals and the next neuron.
  17. 23. nerves extending from the brain and spinal cord.
  18. 24. conduct impulses away from the cell body; only one per neuron.
  19. 27. gathering information
  20. 28. matter is collections of myelinated fibers (tracts).
  21. 31. matter mostly unmyelinated fibers and cell bodies.
  22. 33. are abundant, star-shaped cells that brace and anchor neurons to blood capillaries.
  23. 36. sodium channels open, and sodium (Na+) diffuses into the neuron.
  24. 37. body nucleus and metabolic center of the cell.
  25. 39. conduct impulses toward the cell body; may be hundreds per neuron.