6.5 Nervous system review crossword

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Across
  1. 4. Chemical messenger that carries signals between neurons
  2. 5. The ion channel that opens during repolarization
  3. 7. Electrical change within neuron from relatively positive to negative
  4. 8. The ion channels that occupy the length of the axon are ____ (2 words)
  5. 11. A rise and fall in voltage/membrane potential across the membrane when a neuron is firing (___ potential)
  6. 12. The ion channel that opens during depolarization
  7. 13. The ____ potential is the minimum stimulus required to open the ion channels
  8. 15. They transmit electrical impulses within the nervous system
  9. 16. Period in which the neuron is unresponsive to stimulation
  10. 18. Sudden change in membrane potential within neuron from relatively negative to positive
Down
  1. 1. Action potentials that move along an axon as a wave of depolarization (2 words)
  2. 2. Junctions between neurons or between neurons and receptor/effector cells
  3. 3. When the inside of the neuron is more negative relative to the outside (___ potential)
  4. 6. Pesticides that are able to irreversibly bind to nicotinic acetylcholine receptors and trigger a sustained response
  5. 9. _______ is commonly released within the autonomic nervous system to promote parasympathetic responses (‘rest and digest’)
  6. 10. An elongated fiber that transmits electrical signals to terminal regions for communication with other neurons/effectors
  7. 14. A fatty, white, and insulating substance that increases the speed of electrical transmission
  8. 17. ____ ions trigger neurotransmitter vesicle release