Variations in the resistivity of blood can give valuable clues to changes in the blood's viscosity and other properties. The resistivity is measured by applying a small potential difference and measuring the current. Suppose a medical device attaches electrodes into a \(1.5-\mathrm{mm}\)-diameter vein at two points \(5.0 \mathrm{~cm}\) apart. What is the blood resistivity if a \(9.0 \mathrm{~V}\) potential difference causes a \(230 \mu \mathrm{A}\) current through the blood in the vein?