Why does the Nernst Equation work for Resting Potentials?
Terrence M. Brannon
brannon at sapo.usc.edu
Wed Jun 26 10:00:16 EST 1996
Let's just take a glial cell which only has resting (permanently open)
channels for K+. This glial cell also has Na+, Cl- on the outside and
inorganic anions on the inside, though only K+ can move freely from
one side to the other.
The Nernst Equation calculates the resting potential of a glial cell
based solely on the valence, and intra and extra cellular conc. of K+
as well as the gas constant and temperature.
My question is: don't Na+ and Cl- and the inorganic anions create a
charge which the K+ must respond to in its passive diffusion?
terrence brannon brannon at rana.usc.edu telephones: home: 213-386-3659
3215 San Marino St. #7, LA, CA 90006 /o)\ office: 310-822-1511x308
http://rana.usc.edu:8376/~brannon \(o/ fax: 310-823-6714
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