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3D model of filaments during contraction of muscle
A 3D computer model of filaments of myosin (in red) reaching out and tugging along filaments of actin (in blue, looking like stands of pearls twined together) during the contraction of a muscle. The model, created by C. David Williams as part of his research on force regulation and the length-tension relationship in muscle, enables researchers to consider the geometry and physics at work on the filaments when a muscle bulges. Williams earned his doctorate at the University of Washington (UW), while conducting this research and is currently a postdoctorate at Harvard University.
The visualization lets researchers see how the individual motor proteins generating force interact with each other to regulate the overall level of force the system develops. The 3D nature of such models also allows researchers to investigate how the spatial arrangement of a muscle's contractile filaments alter the force generated as the muscle goes from very long to very short lengths.
The work was supported in part by the National Science Foundation (grant IOS 10-22471, awarded to T.L. Daniel and T.I. Irving to support non-modeling aspects of this research).
To learn more, see the UW news story Biceps bulge, calves curve, 50-year-old assumptions muscled aside. (Date of Image: May 2013)
Credit: ©C. David Williams, University of Washington
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