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Using the information from a standard reduction potentials table (see link below), the standard cell potential for the zinc/lead cell is then: EÂºcell = EÂºcathode - EÂºanode = -0.13 - (- 0.76) = 0.63 V.
The sodium and potassium channels in these cells are voltage-gated, which means that they can open and close depending on the voltage across the membrane. The normal membrane potential inside the axon of nerve cells is 70mV, and since this potential can change in nerve cells it is called the resting potential.