Bioelectricity: Electric model of the cell membrane
Calculating the Nernst potential: Nernst potential
Use the following Nernst equation to calculate the equilibrium potential in mV for an ion with a semi-permeable membrane \[E_\mathrm{ion} = -\frac{60}{z}\log_{10}\left(\frac{C_\mathrm{i}}{C_\mathrm{e}}\right)\] where \(z\) is the valence of the ion, \(C_\mathrm{i}\) is the ion concentration inside the cell, \(C_\mathrm{e}\) is the ion concentration outside the cell, and the base 10 logarithm is used.
Compute the equilibrium potential for the ion \(\mathrm{Ca}^{2+}\) when the concentration inside the cell equals \(6.0E-5\;\mathrm{mM}\)and outside the cell \(0.9\;\mathrm{mM}\). Round to one decimal place.
Compute the equilibrium potential for the ion \(\mathrm{Ca}^{2+}\) when the concentration inside the cell equals \(6.0E-5\;\mathrm{mM}\)and outside the cell \(0.9\;\mathrm{mM}\). Round to one decimal place.
| \(E_{\mathrm{Ca}^{2+}}={}\) | mV (rounded to one decimal place) |
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