<physiology> General term for an intimate cytoplasmic contact, mediated by gap junctions, between touching cells, such that electrical current injected into either cell changes the membrane potential of both. ... In neurons, arrays of gap junctions form electrical synapses, that allow action potentials to pass directly between cells. However,...
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Of two physically touching cells, denoting the presence of a junction that allows the passage of electrical current. Usually tested by impaling both cells with microelectrodes, injecting a current into one, and looking for a change in potential in the other. Usually taken as an indication of coupling by gap junctions or electrical synapses: see also dye coupling. Electrical coupling is not confined to excitable cells: many embryonic and adult epithelia are coupled, possibly to allow metabolic cooperation.
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