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Physio adamson ch3b
Chapter 3b terms
| Question | Answer |
|---|---|
| Depolarization | to change membrane potential value toward zero so that cell interior becomes less negative than resting level |
| Repolarization | return transmembrane potential to its resting level |
| Hyperpolorization | to increase the difference in electric potential across (a cell membrane). |
| Overshoot | part of the action potential in which the membrane potential goes above zero |
| Non-gated channel | do not require another chemical for solute movement through the channel. |
| Voltage-gated channel | cell-membrane ion channel opened or closed by changes in membrane potential |
| Ligand-gated channel | membrane channel operated by the binding of specific molecules to channel proteins |
| Mechanically-gated channel | deformation of the cells of stretch receptors opens ion channels |
| Threshold (or threshold potential) | membrane potential to which excitable membrane must be depolarized to initiate an action potential |
| Refractory period | time during which an excitable membrane does not respond to a stimulus that normally causes response; |
| All-or-none | pertaining to event that occurs maximally or not at all |
| subthreshold stimulus | stimulus capable of depolarizing membrane but not by enough to reach threshold |
Created by:
xsavier1
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