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Related Experiment Videos

Variability in erythrocyte deformability among various mammals.

J E Smith, N Mohandas, S B Shohet

    The American Journal of Physiology
    |May 1, 1979
    PubMed
    Summary

    Red blood cell deformability varies significantly across animal species. Larger red blood cells generally deform more easily, though some species exhibit unique responses to stress.

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    Area of Science:

    • Comparative physiology
    • Hematology
    • Biophysics

    Background:

    • Erythrocyte deformability is crucial for blood circulation.
    • Previous studies primarily focused on human red blood cells.
    • Understanding interspecies variations in erythrocyte mechanics is important.

    Purpose of the Study:

    • To investigate erythrocyte deformability across 25 different animal species.
    • To correlate erythrocyte size with its ability to deform under shear stress.
    • To identify species with atypical erythrocyte deformability.

    Main Methods:

    • Viscometric technique used to measure erythrocyte deformability.
    • Erythrocytes from 25 animal species were analyzed.
    • A deformability index was calculated based on cell dimensions under stress.

    Main Results:

    • Erythrocyte diameters varied from 3.3 (goat) to 11.4 microns (elephant seal).
    • Most erythrocytes deformed readily under fluid shear stress.
    • A positive correlation was observed between erythrocyte size and deformability index.
    • Pygmy goat, goat, Batanga horse, and miniature horse erythrocytes showed reduced deformability.
    • Camel and llama erythrocytes, being ellipsoidal, oriented in the stress field without deforming.

    Conclusions:

    • Erythrocyte size is a significant factor influencing deformability across species.
    • Certain animal species possess erythrocytes with inherently lower deformability or different mechanical responses.
    • These findings contribute to the comparative understanding of red blood cell physiology.

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