As time goes on, what happens to the potential difference across the membrane of this single segment? As time goes on, what happens to the potential difference across the membrane of this single segment? It increases linearly toward its maximum value. It increases exponentially toward its maximum value. It increases, but asymptotes at its maximum value. It decreases linearly toward its minimum value. It exponentially decays to its minimum value. It decreases, but asymptotes at its mimimum value.