physics

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Across
  1. 2. - A cell with an internal negative charge surrounded by the positive charge
  2. 6. - When the voltage of the membrane drops below its resting potential
  3. 9. -the energy that enables things to move
  4. 11. - Converts electrical signals and relays them to another neuron
  5. 12. - The time in which the axon is unable to respond to further stimuli
Down
  1. 1. - Electric potential difference
  2. 3. node -the natural pacemaker that keeps a resting heart rate
  3. 4. - Insulates the axon
  4. 5. - Surrounds a nerve cell at its resting potential
  5. 7. - Part of the neuron that carries electrical impulses
  6. 8. - A nerve cell
  7. 9. drinks -cause your heart rate to increase
  8. 10. -a muscle that contracts to deliver nutrients around the body