Chapter 3
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6 terms
Terms | Definitions |
|---|---|
 Neurons | Information transmitting cells of the nervous system. |
| Glia | They provide insulation (myelin), and remove waste products and foreign bodies. 10 times as numerous. |
| Anatomy of a neuron | cell body (soma) dendrites axon |
| Action potentials | An un-stimulated axon has resting potential. Resting potential is an electrical polarization across the membrane covering the axon. A polarized axon has an inside charge that is negative (-70 millivolts) relative to the outside. |
| Action potentials how it works | When a message from a neighboring cell excites part of the axon's membrane, some of the sodium gates are opened and sodium can enter the axon. This makes the charge inside the cell positive. Depolarization has taken place. |
| Synapses | Communication between neurons occurs at the synapses. |
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