The Nervous System

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Across
  1. 4. Hillock: The part of a neuron where the action potential begins
  2. 5. Junction: a small passage way between cells that permits small particles (ions, etc) to pass but not larger molecules
  3. 9. Change in membrane polarization to more negative values than at resting potential
  4. 11. potential: The level of depolarization that the neuron needs to reach to reach action potential
  5. 12. Cleft: The space at the end of axon there neurotransmitters travel across
  6. 16. Conduction: The propagation of action potentials in unmyelinated fibers.
  7. 18. Nervous system: Has Afferent and Efferent neuron divisions
  8. 19. Cells: Support interneurons physically, metabolically, and functionally
  9. 21. The input of many neurons on to one neuron
  10. 24. The junction between two neurons, or between a neuron and a target call.
  11. 25. potential: An all-or-nothing response in the membrane potential, lasting 1 millisecond
Down
  1. 1. Nervous System: The efferent division of the PNS that deals with rest/digest
  2. 2. Change in the membrane polarization to a more positive value than at resting potential
  3. 3. Neurons that connect the neurons within the CNS
  4. 6. Terminals: The endings of a neurons that branch out, where the neurotransmitters are released
  5. 7. The output of one neuron goes to many other neurons
  6. 8. Wraps around the axon and acts as an insulator to the current flow
  7. 10. Refractory Period: A brief period where another action potential can not happen
  8. 13. The branching elements of a neuron that receive signals from other neurons
  9. 14. Nervous System: The efferent division of the PNS that deals with fight/flight
  10. 15. Nervous System: The efferent division of the PNS that deals with skeletal muscles
  11. 17. Nervous System: The brain and spinal chord
  12. 20. Refractory Period: A brief period where higher intensity stimulus is needed to generate a second (weaker) action potential
  13. 22. of Ranvier: small gaps in the myelinated axon where the membrane is exposed
  14. 23. Potential: Local changed in the membrane potential