Each thick filament of a skeletal muscle fiber consists of ___________. A. chains of myosin molecules ules B. six molecules coiled into helical structure C. two actin protein strands coiled helically around each other D. a rod- shaped structure with "heads' projecting from each end
The thick filaments are composed of myosin, and the thin filaments are predominantly actin, along with two other muscle proteins, tropomyosin and troponin.
