Nervous System Crossword

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Across
  1. 1. Major neurotransmitter operating at the neuromuscular junction and within the autonomic system.
  2. 3. Period following an action potential during which a neuron cannot easily fire another impulse.
  3. 4. Division of the peripheral nervous system that mediates voluntary motor control of skeletal muscles.
  4. 9. Primary cell body of a neuron containing the nucleus and organelles.
  5. 10. Slow, uninsulated conduction of an action potential along every segment of an unmyelinated axon.
  6. 11. Gap in the myelin sheath along an axon where voltage-gated ion channels are concentrated.
  7. 13. Phase of an action potential characterized by rapid influx of sodium ions into the cell.
  8. 16. Cluster of neuron cell bodies situated within the PNS.
  9. 17. Star-shaped CNS glial cell that supports the blood-brain barrier.
  10. 19. Resident phagocytic macrophage of the CNS that removes pathogens and debris.
  11. 21. Primary extracellular cation whose influx drives the rapid depolarization phase of an action potential.
  12. 23. Specialized ciliated glial cell that produce CSF.
  13. 24. Glial cell in the PNS responsible for myelinating a single axon segment.
  14. 27. Refractory period during which a second action potential can only be triggered by a stronger-than-normal stimulus.
  15. 28. Central nervous system glial cell that forms myelin sheaths around multiple neighboring axons
Down
  1. 2. Chemical signaling agent released into the synaptic cleft.
  2. 4. Integration of multiple simultaneous or sequential synaptic inputs at the axon hillock.
  3. 5. Cluster of neuron cell bodies in the central nervous system.
  4. 6. Functional junction where a neuron communicates with a postsynaptic cell.
  5. 7. Division of the nervous system regulating involuntary functions of smooth muscle, cardiac muscle, and glands.
  6. 8. Measure of electrical potential difference between the inside and outside of a cell membrane.
  7. 12. Phase of an action potential characterized by the efflux of potassium ions to restore negative voltage.
  8. 14. Microscopic gap between a neuron and a responding cell.
  9. 15. Lipid-rich insulating sheath wrapping around axons.
  10. 18. Long single projection of a neuron that conducts electrical impulses.
  11. 20. Localized change in membrane potential that varies in magnitude according to stimulus intensity.
  12. 22. Rapid propagation of an action potential jumping from one node of Ranvier to the next.
  13. 25. Refractory period during which another action potential cannot be generated regardless of stimulus strength.
  14. 26. Membrane potential in a non-conducting neuronal membrane, typically measured at -70 mV.
  15. 29. Branched extension of a neuron that receives incoming synaptic signals.
  16. 30. Membrane potential (~ -55 mV) required to open voltage-gated channels and trigger an action potential.