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The Resting Membrane Potential01:21

The Resting Membrane Potential

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Related Experiment Video

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Preparation and Utilization of Freshly Isolated Human Detrusor Smooth Muscle Cells for Characterization of 9-Phenanthrol-Sensitive Cation Currents
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Altered resting membrane potential in the supersensitive vas deferens of the guinea pig.

W W Fleming, D P Westfall

    The Journal of Pharmacology and Experimental Therapeutics
    |February 1, 1975
    PubMed
    Summary

    Postjunctional supersensitivity in the vas deferens is linked to cellular changes, specifically a reduced resting membrane potential. This depolarization appears to involve decreased calcium binding to the cell membrane.

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    Area of Science:

    • Neuroscience
    • Physiology

    Background:

    • Postjunctional supersensitivity is a key phenomenon in the nervous system.
    • Cellular mechanisms underlying this supersensitivity require further elucidation.

    Purpose of the Study:

    • To investigate cellular changes associated with postjunctional supersensitivity in the vas deferens.
    • To explore the role of membrane potential and calcium in this process.

    Main Methods:

    • Utilized microelectrodes to measure cellular changes in the vas deferens.
    • Induced chronic decentralization and denervation to observe effects.
    • Studied the time course of depolarization and measured junction potentials.

    Main Results:

    • Chronic decentralization/denervation led to partial depolarization of vas deferens cells.
    • Depolarization onset and plateau coincided with the development of postjunctional supersensitivity.
    • No significant difference in junction potentials between control and decentralized cells.

    Conclusions:

    • Postjunctional supersensitivity in the vas deferens may be partly caused by a reduced resting membrane potential.
    • A decrease in calcium bound to the cell membrane is hypothesized to contribute to this depolarization and supersensitivity.