The Nervous System

4. Hillock: The part of a neuron where the action potential begins
5. Junction: a small passage way between cells that permits small particles (ions, etc) to pass but not larger molecules
9. Change in membrane polarization to more negative values than at resting potential
11. potential: The level of depolarization that the neuron needs to reach to reach action potential
12. Cleft: The space at the end of axon there neurotransmitters travel across
16. Conduction: The propagation of action potentials in unmyelinated fibers.
18. Nervous system: Has Afferent and Efferent neuron divisions
19. Cells: Support interneurons physically, metabolically, and functionally
21. The input of many neurons on to one neuron
24. The junction between two neurons, or between a neuron and a target call.
25. potential: An all-or-nothing response in the membrane potential, lasting 1 millisecond

1. Nervous System: The efferent division of the PNS that deals with rest/digest
2. Change in the membrane polarization to a more positive value than at resting potential
3. Neurons that connect the neurons within the CNS
6. Terminals: The endings of a neurons that branch out, where the neurotransmitters are released
7. The output of one neuron goes to many other neurons
8. Wraps around the axon and acts as an insulator to the current flow
10. Refractory Period: A brief period where another action potential can not happen
13. The branching elements of a neuron that receive signals from other neurons
14. Nervous System: The efferent division of the PNS that deals with fight/flight
15. Nervous System: The efferent division of the PNS that deals with skeletal muscles
17. Nervous System: The brain and spinal chord
20. Refractory Period: A brief period where higher intensity stimulus is needed to generate a second (weaker) action potential
22. of Ranvier: small gaps in the myelinated axon where the membrane is exposed
23. Potential: Local changed in the membrane potential