myofibril


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Related to myofibril: myofilament, sarcoplasmic reticulum

myofibril

 [mi″o-fi´bril]
one of the slender threads of a muscle fiber, composed of numerous myofilaments; called also muscle fibril. adj., adj myofi´brillar.
Bundles of myofibrils in a muscle. From Damjanov, 2000.

my·o·fi·bril

(mī'ō-fī'bril),
One of the fine longitudinal fibrils occurring in a skeletal or cardiac muscle fiber comprising many regularly overlapped ultramicroscopic thick and thin myofilaments.
[myo- + Mod. L. fibrilla, fibril]

myofibril

(mī′ə-fī′brəl, -fĭb′rəl)
n.
Any of the threadlike fibrils that make up the contractile part of a striated muscle fiber and are made up chiefly of actin and myosin filaments.

myofibril

A bundle of contractile fibres within muscle cells.

my·o·fi·bril

(mī'ō-fī'bril)
One of the fine longitudinal fibrils occurring in a skeletal or cardiac muscle fiber and consisting of many regularly overlapped ultramicroscopic thick and thin myofilaments.
[myo- + Mod. L. fibrilla, fibril]

myofibril

a microscopic contractile filament of STRIATED MUSCLE, made up of a series of SARCOMERES. The myofibril is made up of numerous longitudinal filaments of two forms, thick (MYOSIN) and thin (ACTIN). See MUSCLE, I-BAND. Relatively little is known of the contraction of smooth muscle, where contractile elements’ are thought to contain both actin and myosin.
References in periodicals archive ?
Sarcomere length and myofibril diameter were measured using electron micrograph images of longitudinal sections of L.
As a comparison with abalone, red meat muscle tissue consists of contractible myofibrils assembled into parallel fibrous bundles interconnected by collagen.
Research muscle contraction and make several drawings showing how the myofibril contracts.
2a); whereas in DXR-treated mice there was loss of myofibrils and focal cytoplasmic vacuolization in about 15% of cells (grade 2) (Fig.
These accumulations have been observed in the central parts of the cell close to the nucleus, but most often they occurred in sarcoplasmic pockets between the plasma membrane and the peripheral myofibrils. The granules were spherical.
Furthermore, when the pH reaches the isoelectric point (pi) of the major proteins (pH = 5.4), the result is a reduced amount of water that can be attracted and held by the protein [24], and a reduced repulsion of structures within the myofibril. Water moves from the myofibril into the extramyofibrillar spaces, where it eventually is lost from the muscle cell [25].
CCLs are defined by the presence of a peripheral zone of normal appearance and a central zone characterized by myofibril misalignment and mitochondrial edema, as observed in cross-sections of muscle fibers (10).
The cytoskeletal structure of myofibril is highly differentiated and forms the scaffold sustaining cardiomyocytes to perform contractile function [17-19].
On the other hand, XOI pretreatment in the IR rats showed scanty areas of myofibril loss with necrosis with little edema and inflammatory cell infiltration.
MANRIQUE (2015) described Myxobolus parasitizing skeletal muscle in Piaractus mesopotamicus (HOLMBERG, 1887); although, in contrast with the present study, only myofibril degeneration was observed in this species rather than the inflammatory infiltrates detected in R.
Meat was analyzed for color, pH, cooking losses, shear force, water holding capacity, lipid oxidation, sarcomere length and myofibril fragmentation index.