Human Muscle

Human Muscle - composed of the protein actin The actin and...

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Human Muscle Muscle is composed of thousands of muscle fibers, each composed of a single muscle cell. As  shown in  Figure 1  , a  muscle cell contains a series of ultramicroscopic filaments called  myofibrils.  Each myofibril is a muscle cell that contains units called  sarcomeres.  Sarcomeres contain thick  microfilaments composed of the protein  myosin.  Sarcomeres also contain thin microfilaments 
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Unformatted text preview: composed of the protein actin. The actin and myosin filaments are arranged parallel to one another, with the myosin filaments' molecular “heads” protruding toward the actin filaments. In skeletal muscle, the overlapping actin and myosin filaments give the muscle fiber a banded, or striated, appearance. Hence the muscle is striated muscle....
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