1. The production of electrical impulses in living organisms or tissues.
2. Referring to a physiological process that generates a significant current which directly contributes to a cell membrane potential or an electric potential (possible electric tension or pressure) that exists on two sides of a membrane or across the wall of a cell.
3. Descriptive of a substance that contributes to an electrical potential across a membrane. 4. A reference to a procedure; such as, the pumping of ions across a membrane, in which a net charge is transferred, so that an electrical field is set up unless the charge can be dissipated by another process.