This video lecture from Support and Movement (F.Sc. second year Biology) covers: Sliding filament model including bridge formation between acting and myosin filaments. It Includes formation of T - tubules, functions of sarcoplasmic reticulum, ATPs and calcium. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.