Chapter 11

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Across
  1. 2. Most abundant CNS glial cells that maintain chemical environment
  2. 5. cells PNS glial cells that myelinate a single axon segment
  3. 7. Long neuron extension that carries impulses away from the cell body
  4. 9. CNS glial cells that myelinate multiple axons
  5. 10. Na⁺ entry makes inside of cell less negative
  6. 11. Structures that receive incoming signals from other neurons
  7. 14. potential Small, local change in membrane potential
  8. 15. Graded potential that moves the membrane toward threshold
  9. 16. ions Trigger neurotransmitter release at the axon terminal
  10. 19. potential All-or-none electrical signal that travels the axon
  11. 20. of ranvier Gaps in myelin that allow saltatory conduction
  12. 21. CNS immune defense cells that remove debris
  13. 22. membrane potential -70 mV state of a neuron at rest
Down
  1. 1. sheath Fatty covering that increases speed of impulse conduction
  2. 3. K⁺ exit restores negativity inside the cell
  3. 4. hillock Region where action potentials begin
  4. 6. Membrane becomes more negative than resting
  5. 8. potassium pump Restores ionic balance by pumping 3 Na⁺ out, 2 K⁺ in
  6. 12. cells Glial cells that circulate CSF
  7. 13. cleft Space between neurons where neurotransmitters are released
  8. 17. refractory period Time when no stimulus can trigger another AP
  9. 18. Graded potential that moves the membrane away from threshold