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Related Experiment Videos

Relation between cell length and force production in urinary bladder smooth muscle

B Uvelius, G Gabella

    Acta Physiologica Scandinavica
    |December 1, 1980
    PubMed
    Summary

    Bladder volume affects smooth muscle cell structure and function. Increased volume reduces muscle wall thickness but increases cell length, impacting force generation in guinea-pig bladders.

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    Area of Science:

    • Urology
    • Physiology
    • Biophysics

    Background:

    • The urinary bladder's smooth muscle layer is crucial for voiding.
    • Understanding how bladder distension affects smooth muscle cell morphology and function is key to comprehending bladder physiology.

    Purpose of the Study:

    • To investigate the relationship between urinary bladder volume and the structural and functional characteristics of its smooth muscle cells.
    • To determine how bladder distension influences muscle cell dimensions and force generation capacity.

    Main Methods:

    • Guinea-pig and rabbit bladders were fixed at various volumes.
    • Tissue samples underwent phase contrast and electron microscopy.
    • Morphometric analysis quantified cell dimensions and packing density.
    • In guinea pigs, volume-active force relationships were measured via pelvic nerve stimulation.

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    Main Results:

    • Increased bladder volume correlated with decreased muscle wall thickness and radial cell number.
    • Smooth muscle cell length increased linearly with bladder radius, indicating no cell slippage.
    • Cell packing density increased with bladder radius.
    • Maximum bladder pressure occurred at 0.15 ml, while maximum wall tension was observed at 2.5 ml (cell length 400 µm).
    • Estimated maximum active force per average smooth muscle cell was 5.5 µN, and per cm² of muscle bundle was approximately 59 N.

    Conclusions:

    • Urinary bladder distension induces significant changes in smooth muscle cell morphology, including increased cell length and packing density.
    • These structural adaptations are directly related to the bladder's force generation capacity during filling.
    • The findings provide quantitative insights into the biomechanical behavior of the detrusor smooth muscle.