Unformatted text preview: two types of filaments, shown in Figure 1: • Thin filaments consist of two strands of the globular protein actin arranged in a double helix. Along the length of the helix are troponin and tropomyosin molecules that cover special binding sites on the actin. • Thick filaments consist of groups of the filamentous protein myosin. Each myosin filament forms a protruding head at one end. An array of myosin filaments possesses protruding heads at numerous positions at both ends....
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- Spring '10
- muscle cell, myofibrils. Myofibrils