sarcomeres
The repeating contractile units of the myofibril, delimited by z bands along its length.
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sarcomeres The functional units of skeletal muscle; consist of ?laments of myosin and actin. PICTURE
saturated fat A fat with single covalent bonds between the carbons of its fatty acids. PICTURE ...
sarcomere
[Gk. sarx, the flesh + meris, part of, portion]
The fundamental, repeating unit of striated muscle, delimited by the Z lines.
sarcoplasmic reticulum ...
Sarcomere The functional unit of a myofibril; its distinct repeating structure is due to the overlapping of thick protein filaments, composed of myosin, and thin filaments, composed of actin and other proteins, ...
sarcomere The contractile unit of a myofibril. The repeating units, delimited by the Z bands along the length of the myofibril.
sarcoplasm The clear, semifluid cytoplasm between the fibrils of muscle fibers.
sarcomere (a, i, and h bands; z and m lines), myofilaments (thin filament/actin, thick filament/myosin, elastic filament/titin, nebulin), tropomyosin, troponin (T, C, I) ...
The anatomy of a sarcomere
The thick filaments produce the dark A band.
The thin filaments extend in each direction from the Z line. Where they do not overlap the thick filaments, they create the light I band.
A sarcostyle may be said to be made up of successive portions, each of which is termed a sarcomere.
A sarcomere (or muscle functional unit) extends from Z line to Z line. Each sarcomere has thick and thin filaments. The thick filaments are made of myosin and occupy the center of each sarcomere.
Distance between 2 adjacent Z lines: sarcomere / actin filament is attached to Z lines and extended into sarcomeres on either side
Striation of actin alone → I band
Striation of myosin alone → H zone
Length of myosin → A band ...
Desmin IFs are structural components of the sarcomeres in muscle cells.
Vimentin IFs can be found in fibroblasts and endothelial cells, they support the cell membrane and keep some organelles in a fixed place within the cytoplasm.
Combine those protein threads with some ions in the muscle cell and you get a huge contraction. The groups of actomyosin contracting are called sarcomeres. All of the muscle cells work together to make a muscle contract.
 See also: Cells, Action, Organ, Muscle, Actin
  
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