First tube from out-in is basically the muscle itself; the outermost layer of the muscle which is epimysium. epimysium is the "membrane" that holds smaller tubes of Perimysium the second biggest "mysium". then comes the endomysium which is the smallest of these. inside the endomysium tubes are located in. These tubes are muscle fibers which are basically the cells. inside the cell there are more tubes of myofibril. These myofibrils hace whats called a sarcomere which is composed of two myofilaments, these are Actin and Myosin.
Actin is the thin filament and Myosin is the thick filament.
these two are the main part of the sarcomere(The smallest contractile unit.)
To contract, the myosin uses ATP to form a cross-bridge with the atin the myosin then slides the actin making the H zone dissapear.
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