A typical cell membrane is 7.1 nm thick and has an electrical resistivity of 1.3 x 10^7 m. If the potential difference between the inner and outer surfaces of a cell membrane is 70mV, how much current flows through an area of 1.0 m^2 of the membrane?
Suppose the thickness of the membrance is doubled, but the resistivity and potential difference remain the same. Does the current increase or decrease?
By what factor does the current increase or decrease?