Table 1 Electric potentials as listed in the Nernst Goldman calculator available at http://nernstgoldman.physiology.arizona.edu/, developed by SH Wright (5)
Ion | Average concentration levels | Membrane permeability (% of K+permeability) | Calculated potentials at normal body temperature (mV) | ||
|---|---|---|---|---|---|
| Â | intracellular | extracellular | Â | Nernst | Goldman |
Skeletal muscle cell (based on 6) | |||||
K+ | 150 | 4.5 | 100 | -93.7 | -88.3 |
Na+ | 12 | 145 | 1 | +66.6 | Â |
Cl- | 4.2 | 116 | 1000 | -88.6 | Â |
Red blood cell (based on 7) | |||||
K+ | 140 | 4.5 | 100 | -91.8 | -14.3 |
Na+ | 11 | 145 | 54 | +68.9 | Â |
Cl- | 80 | 116 | 21 | -9.9 | Â |