I need goldmans formula while its containing calcium?

Question

S Hi... can you help me about goldmans formula/?
it talks about equilibrium potential but as we all know in miofibrils calcium is also important can you tell me the formula containing Ca ?
ofcourse the problem is that its 2+ thus others(cl-na &k)are 1+
it must be changed musn`t?
because ca has a charge of 2+ but other ions in normal formula(k .cl .na) have the charge of 1
plz help please tell me the new formula i really need it
thanx

Answer 1

Hi. This was what I found. http://en.wikipedia.org/wiki/GHK_current_equation