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Linear electrical properties of isolated cardiac cells

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Summary

A frequency domain equivalent circuit analysis of isolated ventricular cells indicated the presence of an internal membrane structure which has a total capacitance four- to sixfold larger than the surface membrane. The internal membrane was mainly attributed to the sarcoplasmic reticulum since other morphological studies have shown that its area is many-fold larger than that of the surface membrane. Corresponding estimates from the transverse tubular system indicate an area less than that of the surface; thus this structure is not a likely candidate for the observed internal capacitance. Measurements in hypertonic solutions showed that the access resistance to the internal membrane reversibly increased as the tonicity was elevated. Freeze-fractured electron microscopic studies confirmed that hypertonic solutions increased the volume of transverse tubular system, which thus appears to have little relation to the access resistance. The most probable source of the access resistance is the diadic junction to the sarcoplasmic reticulum, which therefore would electrically couple it to the surface membrane.

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Authors and Affiliations

  1. II. Physiologisches Institut, Universität des Saarlandes, D665, Homburg, West Germany

    Annerose Schmid & Gerrit Isenberg

  2. Department of Physiology and Biophysics, University of Texas Medical Branch, 77550, Galveston, Texas

    L. E. Moore

Authors
  1. L. E. Moore
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  2. Annerose Schmid
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  3. Gerrit Isenberg
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Moore, L.E., Schmid, A. & Isenberg, G. Linear electrical properties of isolated cardiac cells. J. Membrain Biol. 81, 29–40 (1984). https://doi.org/10.1007/BF01868807

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  • DOI: https://doi.org/10.1007/BF01868807

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