thin filament


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Related to thin filament: Thick filament

ac·tin fil·a·ment

one of the contractile elements in muscular fibers and other cells; in skeletal muscle, the actin filaments are about 7.5 nm wide and 1 mcm long, and attach to the transverse Z filaments.
Synonym(s): thin filament

thin filament

In a sarcomere, one of the collection of contractile filaments made primarily of actin, seen microscopically.
References in periodicals archive ?
1998) A new look at thin filament regulation in vertebrate skeletal muscle.
1980) X-ray structure analysis of the thin filament of crab striated muscle in the rigor state.
In comparison, muscle fibers in the Type II category are composed of thin filament and have a striated appearance.
However, the finding that muscle fiber composed only of thin filament is categorized into two types is deemed to be a characteristic of muscle fiber of the spiny top shell, Bartillus cornutus.
In the folded contractile layer of coelomyarian muscle, the dense bodies connect the thin filaments perpendicularly to the basal lamina, as in platymyarian muscle, but most of the basal lamina is in the form of a longitudinal ribbon that extends radially inwards between the cells [ILLUSTRATION FOR FIGURE 1 OMITTED].
Hence, the links between thin filaments and the cuticle are the same in the two types, but with the radial extension of the basal lamina in coelomyarian muscle.
Twelve thin filaments of air twisted together are known as a multiple-spiral air twist; while a sharply twisted single filament is called a corkscrew - because that's what it looks like.
Long, thin filaments radiate from the umbra into a brighter surrounding region called the penumbra.
Surrounded by the solar surface's complex granulation, sunspot groups AR 1785 (right) and 1788 display thin filaments within their penumbrae in this high-resolution image.
The variations indicate thin filaments just 10,000 to 30,000 kilometers wide in the larger meteoroid stream.
Within each cell, rows of thin filaments jut out toward each other, like combs aligned teeth-to-teeth.
When the fiber receives a signal to contract, the thick filaments pull the combs together by "rowing" against the thin filaments.