|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) |
|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.|