CH 45 NEURONS, SYNAPSES AND SIGNALING

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