Oscilloscope screen

Resting potential

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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Essentials of Human Physiology

Essentials of Human Physiology

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.

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