Nervous System Quiz Two Review

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Across
  1. 2. Branch-like parts of a neuron that receive signals.
  2. 6. Star-shaped cells that anchor neurons to blood vessels.
  3. 9. Neurotransmitter involved in reward, pleasure, and motivation.
  4. 10. These cells form the myelin sheath in the Peripheral Nervous System.
  5. 12. The insulating layer that speeds up nerve impulses.
  6. 13. Gaps in the myelin sheath that allow impulses to "jump."
  7. 14. The electrical state of a neuron when it is not transmitting an impulse (approx. -70 mV).
  8. 16. These cells produce and circulate cerebrospinal fluid.
  9. 17. The main body of the neuron containing the nucleus.
  10. 20. Neurotransmitter that stimulates skeletal muscle contraction.
  11. 21. The most common excitatory neurotransmitter; vital for memory.
  12. 23. Neurotransmitter responsible for the "fight or flight" response.
  13. 24. Motor nerves that conduct impulses away from the CNS.
Down
  1. 1. Chemicals released from vesicles that "jump" the synapse.
  2. 3. An involuntary, instantaneous response to a stimulus.
  3. 4. Support cells that are 10x more abundant than neurons.
  4. 5. Specialized cells that receive and transmit electrical impulses.
  5. 7. The gap between two neurons where communication occurs.
  6. 8. The long threadlike part of a nerve cell that conducts impulses.
  7. 10. The physical space between two neurons.
  8. 11. The process where sodium influx reverses the membrane charge.
  9. 15. This system controls conscious and voluntary responses.
  10. 18. An inhibitory neurotransmitter that calms the nervous system.
  11. 19. These neurons transmit impulses away from the CNS to muscles.
  12. 22. Sensory nerves that conduct impulses toward the CNS.
  13. 25. The "All-or-____" rule states an impulse occurs fully or not at all.