Muscle Tissue

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Related to Muscle Tissue: skeletal muscle tissue

Muscle Tissue


the tissue constituting the bulk of the mass of muscles and accounting for the contractile function of muscles. The following types are distinguished: striated (skeletal and heart), smooth, and doubly oblique striated.

Almost all skeletal muscle tissue in vertebrates develops from myotomes, the paired metameric rudiments of the body musculature. Myoblasts, which are mononuclear cells, divide rapidly in ontogenesis and upon fusing together give rise to bundles, which are then transformed into differentiated muscle fibers, the main structural element of striated muscle. The striation of the fibers is due to the alternation of numerous contractile strands known as myofibrils, which are structures differing in physico-chemical and optical properties.

Smooth muscle tissues of the skin, of walls of organs along the gastrointestinal and urogenital tracts, and of walls of blood vessels develop from mesenchymal cells. The smooth muscle cells of salivary, sweat, and mammary glands derive from the ectoderm. All smooth muscle cells are mononuclear and spindle-shaped.

Muscle tissue with doubly oblique striation is comparatively rare. It is found in some worms and in the obturator muscles of bivalve mollusks. Striation appears at an acute angle (10° to 15°) to the longitudinal axis of the muscle fiber where the dark and light disks of adjacent myofibrils coincide with some regular displacement. This muscle tissue is characterized by slow contraction and the ability to remain contracted over many hours with only a slight loss of energy.

References in periodicals archive ?
Engineering human pluripotent stem cells into a functional skeletal muscle tissue," Nature Communications, 2018; 9 (1) DOI: 10.
The mRNA level of IL-21R is shown in [Figure 1]b; in contrast to IL-21, IL-21R mRNA in inflamed muscle tissue of patients with DM and PM was not significantly upregulated compared with that in normal controls (DM vs.
Existing tests for cardiac muscle tissue damage need a blood draw and a reader to interpret results, and usually require up to 30 minutes to complete in a lab.
She said that these new approaches involve maintaining or increasing the activity of cardiac stem cells so that muscle tissue in the heart can be renewed with new heart cells, replacing old cells or those damaged by wear and tear.
The goal of the project was to speed up the body's natural recovery process as well as prompt the development of new muscle tissue.
Skeletal muscle tissue is the same, whether it belongs to humans or animals, and we must work at keeping muscle mass, otherwise that mass wastes away.
Muscle tissues are made of elongated cells, called fibers, that contract and relax to produce movement.
This is a very metabolically demanding method of strength training that provides a high level of stimulation to muscle tissue.
Bioheart is focused on developing cellular-based therapies to regenerate heart muscle tissue.
The assay was suitable for application in small samples of human muscle tissue (>30 mg) and separated all of the above-mentioned analytes of interest.
As the human body ages, it experiences steady declines in muscle tissue, thus lowering calorie needs.
Our recent study of food-web dynamics in a subtropical lake reveals wide ranges of stable carbon and nitrogen isotope composition in the muscle tissue of blue tilapia (Gu et al.