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To cross the membrane of a cell, an ion is subjected to an electrochemical gradient (or driving force in English), which is expressed by the difference between the membrane potential (Vm) of the cell and the potential of the cell. balance of the ion considered (Eion). The net flow of an ionic species through its own channels is proportional to this electrochemical gradient.
If (Vm-Eion) & gt; 0 then the net flow is outgoing. If (Vm-Eion) <0 then the net flow is incoming.
At equilibrium the electrochemical gradient is zero because (Vm = Eion). Related articlechange code
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