Anatomy Chapter 12 - 2

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Across
  1. 2. Refractory period where action potentials cannot be generated
  2. 3. Protective fluid that fills the spinal cord passageway and the brain
  3. 5. An insulating sheath around an axon
  4. 7. Areas containing neuron cell bodies, and unmylinated axons have a dusky grey color
  5. 10. The membrane potential at which an action potential begins
  6. 11. A_____propagation occurs in unmylinated axons
  7. 12. A_____propagation occurs in mylinated axons
  8. 14. Outer surface of a Schwann cell that encircles an axon in the PNS
  9. 16. In___summation stimuli is applied at different locations, have a cumulative effect on the membrane potential
  10. 17. The depolarization of a postsynaptic membrane by a chemical neurotransmitter
Down
  1. 1. Cell bodies of neurons in the PNS are clustered in masses
  2. 4. The temporal or spatial addition of contractile force or neural stimuli
  3. 6. What potential effects are strongest at the site of stimulation but gets weaker with distance
  4. 8. In___summation stimuli occurs in rapid succesion at a single synapse that is active repeatedly
  5. 9. Also called leukocytes, myelinated axons of the CNS
  6. 13. Refractory period where action potentials can be generated
  7. 15. A hyperpolarization of the postsynaptic membrane after the arrival of a neurotranmitter