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            <title xml:lang="en">Influence of dispersion in myosin filament orientation and anisotropic filament contractions in smooth muscle</title>
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                <title xml:lang="en">Influence of dispersion in myosin filament orientation and anisotropic filament contractions in smooth muscle</title>
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                <term xml:lang="en">Biomechanics</term>
                <term xml:lang="en">Soft biological tissue</term>
                <term xml:lang="en">Smooth muscle</term>
                <term xml:lang="en">Myosin</term>
                <term xml:lang="en">Statistical dispersion</term>
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              <p>A new constitutive model for the biomechanical behaviour of smooth muscle tissue is proposed. The active muscle contraction is accomplished by the relative sliding between actin and myosin filaments, comprising contractile units in the smooth muscle cells. The orientation of the myosin filaments, and thereby the contractile units, are taken to exhibit a statistical dispersion around a preferred direction. The number of activated cross-bridges between the actin and myosin filaments governs the contractile force generated by the muscle and also the contraction speed. A strain-energy function is used to describe the mechanical behaviour of the smooth muscle tissue. Besides the active contractile apparatus, the mechanical model also incorporates a passive elastic part. The constitutive model was compared to histological and isometric tensile test results for smooth muscle tissue from swine carotid artery. In order to be able to predict the active stress at different muscle lengths, a filament dispersion significantly larger than the one observed experimentally was required. Furthermore, a comparison of the predicted active stress for a case of uniaxially oriented myosin filaments and a case of filaments with a dispersion based on the experimental histological data shows that the difference in generated stress is noticeable but limited. Thus, the results suggest that myosin filament dispersion alone cannot explain the increase in active muscle stress with increasing muscle stretch.</p>
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