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Related Experiment Videos

Blood flow in contracting arterioles.

G W Schmid-Schönbein, H Murakami

    International Journal of Microcirculation, Clinical and Experimental
    |January 1, 1985
    PubMed
    Summary
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    Blood flow in contracting arterioles with non-circular shapes is altered. Endothelial protrusions increase resistance and velocity but decrease average wall shear stress compared to circular vessels.

    Area of Science:

    • Physiology
    • Biomedical Engineering
    • Fluid Dynamics

    Background:

    • Arteriolar blood flow is crucial for tissue perfusion.
    • Endothelial cell shape significantly influences microvascular hemodynamics.
    • Non-circular cross-sections in arterioles are common due to cellular structures.

    Purpose of the Study:

    • To investigate blood flow patterns in contracting arterioles with non-circular cross-sections.
    • To analyze how endothelial protrusions affect fluid dynamics.
    • To compare flow characteristics with idealized Poiseuille flow in circular tubes.

    Main Methods:

    • Numerical computation of flow fields for a viscous Newtonian fluid.
    • Utilized electron micrographs of skeletal muscle arterioles at various contraction stages.

    Related Experiment Videos

  • Modeled non-circular cross-sections caused by endothelial protrusions.

    • Main Results:

    • Flow deviates significantly from Poiseuille flow predictions for circular tubes.
    • Vessel resistance is elevated due to non-circularity.
    • The ratio of maximum to mean velocity increases beyond the Poiseuille value of 2.
    • Wall shear stress becomes non-uniform, with peaks at protrusions and near-zero values at cell junctions.
    • Average wall shear stress is lower than in equivalent circular vessels.

    Conclusions:

    • Endothelial protrusions in contracting arterioles create complex flow fields.
    • Non-circularity elevates resistance and alters velocity profiles.
    • Wall shear stress distribution is highly heterogeneous, impacting endothelial cell function.
    • These findings are critical for understanding microcirculation and vascular disease.