Nernst Potential for Potassium...
E (mv) = +/- 62 Lg10 [
[ Ci ]
[ Co ] = 1.0 mM K and [ Ci ] = 7.0 mM
E = + 62 Lg10 1.0/7.0
= + 62 Lg10 0.1428
= + 62 -(0.8453)
E = - 52.4 mV is the value of the calculated Nernst Potential
since the measured bioelectric potential inside the cell is
+ 10 mV then, K does NOT move passively across this membrane,
and therefore K must move ACTIVELY.