A sarcomere (Greek sárx = "flesh", méros = "part") 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 titin. It also contains
myosin-binding protein C which binds at one end to the thick filament
and the other to Actin.

The thin filaments are assembled by Actin monomers bound to nebulin,
which also involves tropomyosin (a dimer which coils itself around the
F-actin core of the thin filament) and troponin.

Nebulin and titin give stability and structure to the sarcomere.

A muscle cell from a biceps may contain 100,000 sarcomeres.[1]
The myofibrils of smooth muscle cells are not arranged into sarcomeres.

For more information on sarcomers click this link

Trigger point practitioners believe that palpable nodules are small
contraction knots and a common cause of pain. Sarcomere's are the basic
unit of the muscle. Compression of the sarcomere fibers let's more oxygen
and blood into the area along with removing waste byproducts in the muscle
thus helping the contracted knots in muscles.
For more information on Trigger Point Therapy click this link

From Wikipedia, the free encyclopedia

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