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Related Experiment Videos

Low resistance pathways between myocardial cells.

R Weingart, I Imanaga, S Weidmann

    Recent Advances in Studies on Cardiac Structure and Metabolism
    |January 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

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    Heart: electrophysiology.

    Annual review of physiology·2009

    Intercalated discs in heart cells offer low resistance to ion diffusion, facilitating action potential propagation. This study quanties ion permeability across these crucial cardiac cell junctions.

    Area of Science:

    • Cardiovascular Physiology
    • Cell Biology
    • Biophysics

    Background:

    • Intercalated discs are specialized junctions between myocardial cells.
    • Their role in ion diffusion and electrical signal propagation is critical for heart function.

    Purpose of the Study:

    • To investigate the electrical resistance of intercalated discs to ion diffusion.
    • To determine the permeability of nexal membranes within these discs.

    Main Methods:

    • Developed a method to study longitudinal diffusion of radioactive potassium (42K), [14C]tetraethylammonium ([14C]TEA), and Procion yellow (PY) in heart bundles.
    • Involved cell loading, ion diffusion, rapid freezing, sectioning into 0.5 mm slices, and concentration measurement.

    Main Results:

    Related Experiment Videos

    • Calculated diffusion coefficients attributed to both discs and myoplasm.
    • Nexal membrane permeabilities were significantly higher than surface membrane permeabilities for all tested substances.
    • Determined a low disc resistance for potassium (0.9 ohm cm2) and estimated nexal pore diameter (10-15 Å).

    Conclusions:

    • Intercalated discs present low resistance pathways for ion movement between myocardial cells.
    • This low resistance supports the propagation of action potentials via local circuit currents.