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Related Experiment Videos

Morphology of the constricted arteriolar wall: physiological implications.

J E Greensmith, B R Duling

    The American Journal of Physiology
    |November 1, 1984
    PubMed
    Summary

    Vasoconstriction causes microvessels to form longitudinal ridges, altering lumen shape. These structural changes impact blood flow resistance and in vivo measurements.

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    Area of Science:

    • Physiology
    • Microcirculation
    • Vascular Biology

    Background:

    • Microvessel constriction is crucial for regulating blood flow resistance.
    • The precise morphological changes in microvessels during vasoconstriction are not fully understood.
    • Understanding these changes is key to comprehending microvascular function.

    Purpose of the Study:

    • To investigate the effects of physiological vasoconstriction on the lumenal size and shape of rat mesenteric arterioles.
    • To characterize the morphology of the luminal surface during vasoconstriction.

    Main Methods:

    • In vitro cannulation techniques were used on isolated rat mesenteric arterioles.
    • Electron microscopy and photomicrograph analysis were employed to assess vessel morphology.
    • Physiological degrees of vasoconstriction were induced.

    Main Results:

    • Vasoconstriction induced the formation of longitudinal ridges on the luminal surface.
    • These ridges ranged from several hundred microns long, with heights of 5-10 microns.
    • Up to 50 ridges were observed around the circumference of a 70-micron vessel.
    • Ridges are composed of endothelial cells, basal elastic lamina, and smooth muscle cytoplasm.
    • These ridges significantly influence the relationship between smooth muscle stress, intraluminal pressure, and lumen diameter.
    • The presence of ridges may affect the accuracy of in vivo microvessel diameter measurements.

    Conclusions:

    • Longitudinal ridges are a key morphological adaptation during microvessel constriction.
    • These structures play a critical role in determining microvascular resistance.
    • Further research into microvessel wall morphology is needed for a complete understanding of smooth muscle regulation of flow resistance.

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