Applying the Nernst equation:
The concentration of K+ ions inside a mammalian neuron is about 140 mM; outside the neuron the concentration is about 5 mM. Putting these numbers into the Nernst equation gives us a predicted resting potential of about -84 mV.
44.7 The Nernst Equation The Nernst equation calculates membrane potential when only one type of ion can cross a membrane that separates solutions with different concentrations of that ion. A resting neuron comes close to that situation because its permeability to K+ ions is high and its permeability to all other ions is low.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.