A sarcomere is the basic unit of a
muscle's cross-striated
myofibril. Sarcomeres are multi-protein complexes composed of three different filament systems. The thick filament system is composed of
myosin protein which is connected from the M-line to the Z-disc by
TitinThe thin filaments are assembled by
actin monomers bound to
Nebulin.Nebulin and Titin gives stability and structure to the sarcomere. A
muscle cell, from a
biceps, may contain 100,000 sarcomeres. The myofibrils of
smooth muscle cells are not arranged into sarcomeres.
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