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Myosin is Thick, Actin is Thin

This is a song that is totally original, to help students learn the sliding-filament model aka the cross-bridge cycle, of how sarcomere's contract. The only parts of this song that are not original are the pictures, which I have edited to fit together well for the purpose of this lesson. The lyrics are as follows: Myosin is thick and actin is thin each of these things are called myofilaments actin is a thin fila-ment-myosin-is-thick hope you got that down, now listen real quick. Myosin has these things called myosin heads they attatch to actin and they pull that thin thread (actin) First the binding site on actin's gotta be free gotta get this thing called tropomyosin to kindly move please Ya see, tropomyosin has a friend the name is troponin they're attached till the end let troponin bind to calcium and then you will see tropomyosin will move and set the binding site free , now that tropomyosin is out of the way myosin can bind to actin today , Now that their bound learn how do they act. How does ATP help to make the muscles contract Myosin is thick and actin is thin each of these things are called myofilaments actin is a thin fila-ment-myosin-is-thick Sit 'em down Brown, and tell 'em real quick. At first, the head has phosphate and ADP then you drop the phosphate, and what will it be? the power stroke happens, and the actin get's pulled this is part of the contraction, let the story unfold Along comes our molecule used for energy of course you know I''m talking bout ATP Myosin binds to ATP, and let's go of actin keep on listening, cause heres the reaction The ATP breaks into ADP and phosphate this energy allows the head to cock all the way if calcium's around it's time to further contract actin's binding sites are free, its time to attatch. Myosin is thick and actin is thin each of these things are called myofilaments actin is a thin fila-ment-myosin-is-thick Sit 'em down Brown, and tell 'em real quick. Myosin is thick and Actin is thin Myosin is thick and Actin is thin