C2.2 Neural signalling

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Across
  1. 2. a cell within the nervous system that carries electrical impulses
  2. 7. a rapid change in charge that causes a propagated nerve impulse
  3. 8. the period where resting potential re-established
  4. 12. electrical signal that travels along the axon of a neuron
  5. 13. is a neurotransmitter with both excitatory and inhibitory actions
  6. 16. the minimum membrane potential (roughly -55 mV) required to fire an action potential
  7. 17. gaps between the Schwann cells myelin sheaths
  8. 19. the type of cell that produces the myelin sheath around axons
  9. 20. the positive ion that influxes into the axon during depolarization
  10. 21. refers to a sudden change in membrane potential
  11. 22. junctions between neurons or between neurons and receptor/effector cells
Down
  1. 1. a chemical messenger released into the synaptic cleft to transmit signals
  2. 3. the maintenance of a difference in charge (polarity) across a neuron's membrane
  3. 4. a short, branched extension of a neuron that carries impulses toward the cell body
  4. 5. the difference in electrical charge or voltage across a plasma membrane
  5. 6. "skipping" of impulses
  6. 9. sheaths an insulating layer around axons
  7. 10. the enzyme that breaks down acetylcholine in the synaptic cleft
  8. 11. ion that enters the presynaptic neuron to trigger the release of neurotransmitters
  9. 14. a long, single nerve fiber that conducts electrical impulses away from the cell body
  10. 15. the positive ion that effluxes out of the axon during repolarization
  11. 18. the membrane potential of a neuron when it is not firing (roughly -70 mV)