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THE EFFECT OF ORGANIC IONS ON THE MEMBRANE POTENTIAL OF NERVES
1Department of Physiology, School of Medicine, University of Pennsylvania, Philadelphia, and the Marine Biological Laboratory, Woods Hole.
The Journal of General Physiology
|October 30, 2009
Summary
Osmotic pressure influences nerve resting potential, with increased pressure raising it and decreased pressure lowering it. Nerve membrane permeability to various organic and inorganic ions affects potential, suggesting a porous membrane structure.
Area of Science:
- Neuroscience
- Biophysics
- Cell Physiology
Background:
- Nerve resting potential is crucial for neuronal function.
- Understanding ion permeability is key to explaining nerve electrical properties.
Purpose of the Study:
- To investigate the influence of osmotic pressure on nerve resting potential.
- To determine the effect of various cations and anions on nerve potential.
- To explore the nerve membrane's permeability characteristics.
Main Methods:
- Experiments on frog sciatic nerve and crab nerves.
- Utilized osmotic pressure changes and ion substitutions.
- Employed collodion membrane as a model for nerve membrane.
Main Results:
- Osmotic pressure directly correlates with nerve resting potential.
- A specific series of cation permeability was identified (e.g., Rb > K > Na).
- Anions also affect nerve potential, indicating partial anion permeability.
Conclusions:
- Nerve membrane behaves as a porous structure, influencing ion passage.
- Collodion membrane models nerve membrane permeability effectively.
- Ion interactions provide insights into resting and after potentials.
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