4. (18 pts) Table below shows 5 different neurons with different numbers of resting Na and K channels. a) Fill in the blank cells of the table. Cell Number of Resting K Number of Resting Time Constant channels Na channels Change in v produced by a pulse of X DA of current 20 msec 20 200 105 10 40 2 3 4 5 10 mV 10 105 200 2 b) Which of the 5 cells has the most positive resting potential? Assume reasonable values for the Na and K Nernst potentials. All neurons have the same capacitance.) Circle the cell number 2 3 5