Nerve impulses and synapsis

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Across
  1. 3. Joint together impulses from multiple neurons
  2. 4. when neurons do fire
  3. 5. several of the ions inside the neurons (Abrv. Elements)
  4. 7. neurons require ____ to fire
  5. 10. when a neuron is not sending signals
  6. 12. helps but NA and K back in place after repolarization
  7. 13. is an electo-chemical signal
  8. 15. stimuli for myelinated neurons only
  9. 18. require for pump to work
  10. 19. what do neurons not undergo?
  11. 20. the amount of stimulatino needed to fire
  12. 21. once threshold is reached, neuron always fires at ____
  13. 22. wave of depolar,repolar, and refract jumps from ___ to ___
Down
  1. 1. needed for an electrical current
  2. 2. lots of stimulation required
  3. 6. little stimulation required
  4. 8. pump made up of ___
  5. 9. Na gates open inside of axon is + & ouside is -
  6. 11. K gates open outside of axon is now + & inside now -
  7. 14. more positive charges outside than inside
  8. 16. amount of na that leaves
  9. 17. amount of potassium that goes in