Neurophysiology
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13 terms
Terms | Definitions |
|---|---|
 irritibility | the ability of a nerve to respond to a stimulus |
| conductivity | the ability of a nerve to transmit an impulse to other nerves, muscles or glands |
| polarized neuron | a neuron that is maintaining a resting potential, having a higher concentration of Na ions outside the membrane and K ions inside the membrane |
| depolarization | the process during the action potential when sodium is rushing into the cell causing the interior to become more positive |
| action potential | the local voltage change across the cell wall as a nerve impulse is transmitted |
| repolarization | The return of membrane potential to normal resting values after a depolarization of hyperpolarization. |
| threshold | the level of stimulation required to trigger a neural impulse |
| all-or-none principle | the law that the neuron either fires at 100% or not at all |
| refractory period | the time after a neuron fires or a muscle fiber contracts during which a stimulus will not create a nerve impluse |
| Na, sodium | ion found in high concentration outside the membrane of a neuron during a resting potential |
| K, potassium | ion found in high concentration inside the membrane of a neuron during a resting potential |
| continuous propagation | the creation of an action potential along the entire length of an unmyelenated axon |
| saltatory propagation | action potential spreads from node to node along an axon at speeds of 40-300 mph |
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