positive afterpotential

the period following termination of the negative afterpotential, during which the potential of an excitable cell membrane is more negative than the resting potential. It is paradoxically called positive because it was first detected outside the cell, where the polarity is reversed.

Medical dictionary. 2011.

Look at other dictionaries:

  • afterpotential — The small change in electrical potential in a stimulated nerve that follows the main, or spike, potential; it consists of an initial negative deflection followed by a positive deflection in the oscillograph …   Medical dictionary

  • afterpotential — noun A small, transitory electrical potential that follows, and is dependent upon the main potential produced when a nerve is stimulated; seen as a small positive or negative spike on an oscillograph output …   Wiktionary

  • positive after-potential — see under afterpotential …   Medical dictionary

  • afterpotential — ˈ ̷ ̷ ̷ ̷ ̷ ̷| ̷ ̷ ̷ ̷ noun Etymology: after (IV) + potential : the sequence of electrical events that follows the spike potential of nerve activity and that usually takes the form of a negative followed by a positive potential with both being of …   Useful english dictionary

  • potential — 1. Capable of doing or being, although not yet doing or being; possible, but not actual. 2. A state of tension in an electric source enabling it to do work under suitable conditions; in relation to electricity, p. is analogous to the temperature… …   Medical dictionary

  • action potential — n a momentary reversal in the potential difference across a plasma membrane (as of a nerve cell or muscle fiber) that occurs when a cell has been activated by a stimulus called also spike potential compare RESTING POTENTIAL see afterpotential …   Medical dictionary

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