what are the effects on resting membrane potential if there is increased extra cellular potassium concentratio

Answer 1

Well assuming that the Nernst equation applies

V=(RT/zF)*ln(Cout/Cin)

and assuming that Cin remains constant at least for the moment you abruptly increase Cout, you will have an increase in the resting potential (VK). E.g. from -89mV to -52mV for [K+]out= 5mM [K+]in=140mM and [K+]out= 20mM [K+]in=140mM

However in cells you have lots of factors acting (osmosis, K leakage, K-Na pump etc). You should have a look at:

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Search&db=books&doptcmdl=GenBookHL&term=resting+potential+AND+mboc4%5Bbook%5D+AND+373393%5Buid%5D&rid=mboc4.section.2027#2031

Answer 2

don't bother my head with that bullshit