Abstract
The equations of the preceding paper are amended to represent voltage clamp instead of an action potential, but without altering the value of any constant. Calculated membrane current densities resemble observed membrane current densities of living, electrically excitable, voltage clamped preparations. The calculated and observed currents are not quite identical, however, and the discussion considers possible explanations for the differences. The calculated sodium current density turns out to be too small to account for the transitory inward current of a depolarizing voltage clamp step. Instead, this inward current is mostly electron current. However, there is electron current in the reverse direction subsequently, and the net electron current is zero if the beginning and ending states of the excitable membrane are the same.
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