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Related Experiment Videos

Shark skin: function in locomotion.

S A Wainwright, F Vosburgh, J H Hebrank

    Science (New York, N.Y.)
    |November 17, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Shark skin stiffness changes with swimming speed due to internal pressure variations. This flexible skin acts as a whole-body exotendon, enhancing muscle power transmission more effectively than their skeleton.

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    Area of Science:

    • Biomechanics
    • Animal locomotion
    • Dermatology

    Background:

    • The mechanical properties of animal skin are crucial for locomotion.
    • Understanding how skin functions in aquatic environments is key to biomechanical studies.
    • Sharks exhibit unique adaptations for efficient swimming.

    Purpose of the Study:

    • To investigate the relationship between hydrostatic pressure, skin stress, and skin stiffness in sharks.
    • To determine how these factors influence the mechanical function of shark skin during swimming.
    • To evaluate the role of shark skin as a whole-body exotendon.

    Main Methods:

    • Analysis of hydrostatic pressure variations under shark skin at different swimming speeds.
    • Measurement of skin stress and its correlation with internal pressure.

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  • Assessment of skin stiffness based on measured stress and pressure.
  • Comparison of the mechanical advantage of the skin exotendon versus the endoskeleton.

    • Main Results:

    • Hydrostatic pressure beneath shark skin dynamically changes with swimming speed.
    • Skin stress directly correlates with internal hydrostatic pressure, influencing skin stiffness.
    • Shark skin functions as an effective whole-body exotendon.

    Conclusions:

    • Shark skin stiffness is a dynamic property regulated by internal pressure and swimming speed.
    • The exotendon function of shark skin provides a superior mechanical advantage for muscle contraction transmission compared to the endoskeleton.
    • These findings offer new insights into the biomechanics of shark locomotion and skin function.