Flashcards: Nervous system-Workbook terms p. 134-136
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Created by:
csaluki762 on April 5, 2010
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Groups:
Anatomy, Schultz's Anatomy Class
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Terms | Definitions |
|---|---|
 Action potential | Impulses travelling down a nerve cell axon. |
| Intracellular | Inside a cell. |
| Refractory period | Period of repolarization during which the neuron cannot respond to a second stimulus. Period of time when all of the K+ are outside the cell and have not yet been pumped back in. |
| Intercellular | Located between cells. |
| De-polarized | Membrane potential becomes LESS NEGATIVE. |
| Repolarization | The stage of impulse transmission when K+ flow out of the cell. The period of change from +55mV to -75mV. |
| Depolarization | The beginning of this stage of impulse transmission is when the Na+ gates open. This phase of impulse transmission involves a large increase in membrane potential resulting in a sudden change from -70mV to +55mV. |
| Stimulus | The name of the signal that starts an action potential. |
| Na+ | These ions cannot move across the membrane unless their gate is open. When they move into the cell, the potential becomes positive. |
| Polarized | The state of having a greater charge on one side than the other of a membrane. |
| Resting membrane potential | The normal potential of the inside of a nerve cell. When the cell's potential is at -70mV. |
| K+ | These ions can move across the membrane even if their gate is closed. When their gates open, they rush out of the cell. |
| Sodium-Potassium pump | This is the machinary that re-establishes resting membrane potential, helping the nerve cell return to normal after an impulse. This pumps sodium and potassium ions across a membrane. |
| Glial cells | These act as a support system for neurons. Cell in the nervous system that is supportive and connective in function. |
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