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Globular protein is associated with the myosin filaments inside of muscle fibers that help them contract, according to the Sliding Filament Theory. The other protein myofilaments that is involved in this process is called actin. Actin chains are, themselves, made up of troponin and tropomyosin proteins that interact with the globular protein, myosin, in the presence of ATP and calcium (Ca++) which makes a sacromere unit contract.When all the sacromeres inside a muscle cells myofibril contract, then the entire muscle cell is said to be contracted.

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