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#Contraction_of_skeletal_muscle #muscle_bundle #muscle_fibre #myofibril #myofilament #actin_filament #myosin_filament #light_band #dark_band #I_band #A_band #Z_line #H_zone #sarcomere #thin_filament #thick_filament #actin_protein #myosin_protein #tropomyosin #troponin #cross_bridges #sliding_filament_model #FSC_PART_2 #BSC #BSHONS#Zoology #prof_masood_fuzail #biologylecture #best_biology_lecture