0779-00 Complete Sarcomere Model

0779-00  Complete Sarcomere Model   Representing a complete sarcomere — the smallest functional unit of striated muscle. Z lines or disks at either end, and scaled to tens of thousands of times actual size, this first-ever working model graphically and functionally illustrates the sliding filament theory of skeletal muscle contraction.   Reflecting recent advances in electron microscopic ultrastructure, the model unequivocally demonstrates that individual myofilaments neither change shape nor shorten, rather the proteins actin and myosin slide past one another, resulting in the shortening of the sarcomere itself. The arrangement, configuration, and function of thin filaments (actin, troponin, tropomyosin), and thick filaments (myosin, myosin heads), the M-line and Z-line are all clearly depicted in fine detail.   Invaluable not only for physiology classes, but also for athletic trainers, sports medicine specialists, physical and massage therapists, the working sarcomere model can