CH 45 NEURONS, SYNAPSES AND SIGNALING

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Across
  1. 2. _________ CONDUCTION: Process where action potentials jump between nodes of Ranvier
  2. 6. Carries information into and out of the CNS via nerves
  3. 9. Insulation around axons that increases action potential speed
  4. 10. Long projection of a neuron that transmits signals to other cells
  5. 12. __________ PERIOD: Time after an action potential when a second one cannot be initiated
  6. 13. Includes the brain and nerve cord for integration
  7. 14. Process where postsynaptic potentials combine to reach threshold
  8. 18. Glial cells that form myelin sheaths in the central nervous system
  9. 21. _______ NEURONS: Neurons that detect external stimuli like light or touch
  10. 22. ______ POTENTIALS: Changes in membrane polarization varying with stimulus strength
  11. 24. Membrane potential level at which an action potential is triggered
Down
  1. 1. ____________ CELLS: Neuron, muscle or gland cells receiving signals from a neuron
  2. 3. ___________ CELLS: Neurons that transmit signals to a neuron, muscle or gland cell
  3. 4. Gaps in the myelin sheath where action potentials jump
  4. 5. _______ GATED ION CHANNELS: Channels that open or close in response to changes in electrical potential of the membrane
  5. 7. Glial cells that form myelin sheaths in the peripheral nervous system
  6. 8. Neurons that integrate sensory information in the nervous system
  7. 11. ______ POTENTIALS: All-or-none signals conducted by axons over long distances
  8. 15. ______ NEURONS: Neurons that transmit signals to muscle cells causing contraction
  9. 16. Junctions where neurons communicate often via neurotransmitters
  10. 17. Hyperpolarizations moving membrane away from threshold
  11. 19. Bundles of neurons in the peripheral nervous system
  12. 20. Depolarizations bringing membrane closer to threshold
  13. 23. Cells that nourish or insulate neurons