A typical cell membrane is 8.0 nm thick and has an electrical resistivity of 1.3 x 10^7 Ω•m (A) If the potential difference between the inner and outer surfaces of a cell membrane is 75 mV, how much current flows through a square area of membrane 1.0 micrometers on a side? Express your answer using two significant figures (B) Suppose the thickness of the membrane is doubled, but the resistivity and potential difference remain the same. Does the current increase?

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Q: Consider a portion of a cell membrane that has a thickness of 7.50 nm and 1.4 µm × 1.4 µm in area. A…

A: ConceptR=ρLAl=VRl=VAρL                l α A                     ρ=resistivity

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