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Imagine another cell with a more typical K+ concentration gradient: [K+]o = 4.5 mM and [K+]i = 140 mM. The Nernst equation calculates EK = -92 mV. Given the previous info, what is this cell’s membrane potential if it is only due to K+ ions?
The membrane potential for a cell that is primarily influenced by potassium (K+) ions can be approximated by the Nernst equation, which you’ve already provided the EK value for.
Since you’ve calculated EK = -92 mV, this means that if the cell’s membrane potential is solely determined by K+ ions, then the membrane potential (Vm) would also be -92 mV.
Explanation:
The Nernst equation accounts for the concentration difference of the K+ ions inside and outside the cell. A Vm of -92 mV indicates that the inside of the cell is negatively charged relative to the outside, which is typical for cells at rest influenced mainly by K+.
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