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Hierarchial Structure of Muscle

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Muscle
organ
Fascicles
individual strings run the entire lenght of the muscle organ (fibers)
Muscle Fibers
muscle cells (contains thousands of myofibrils)
Myofibrils
organelles
Myofilaments
-thick filaments made of Myosin (a protein)
-thin filaments made of Actin (a protein)