A body builder’s skeletal muscle constituents have been determined to be fibers that are multinucleated. Their cell's nucleus is always located slightly beneath the natural plasma membrane. Most skeletal muscle cells comprise a series of thread-like stripes or striate called myofibrils. Inside each myofibril numerous protein filaments are firmly anchored by dark Z characteristic line. This Z-like line is a fiber which is not very long but continuous in a pinstripe structure.

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