1. The problem statement, all variables and given/known data A cell 20 microns long and 2 microns in diameter enclosed in a membrane 80 nonometers thick with a dielectric constant of 8 (neglet the ends). The cell has a potential difference between outside and inside of -70 millivolts, calculate the extra chlorine ions that must be present inside the cell. Assume that extracellular fluid is infinite. Determine the radial flux density (jr) of chlorine ions if after depolarization, the cell takes 80 milliseconds to recover. 2. Relevant equations I don't know. 3. The attempt at a solution I don't know the equations and cannot formulate my answer based on this.