| 词汇 | myofibril |
| 释义 | myofibril noun[ C ] anatomy specializeduk /ˌmaɪ.əʊˈfaɪ.brɪl/ us /ˌmaɪ.oʊˈfaɪ.brəl/ any of several fibrils(= thread-like structures) inside a muscle cell that work together to make the muscle contract(= become shorter) or relax: The shape of the muscle cell is determined by the arrangement of the myofibrils. In these cases, the contractile response of the individual myofibrils may be normal. Each of these bundles consists of four myofibrils. The longitudinal section of part of a muscle cell shows a layer of longitudinally running myofibrils. The protein plays a critical role in myofibril assembly and proper heart development. Substances & structures in the body abductor accessorius ACL actin adductor fundus funiculus fusiform glomerular glomerulus navicular neuroendocrine neurohormonal neurohormone nociceptive tendinous tendinum tendo tensor Th You can also find related words, phrases, and synonyms in the topics: Cells Related wordmyofibrillar Examples of myofibrilmyofibril Histologically, there is proliferation of both myofibrils and mitochondria. The central zone of fibrosis was surrounded by muscle myofibrils containing clusters of sporophorous vesicles. They postulated that a certain range of cardiac contractility and intracardiac circulation is necessary for continued growth and proliferation of the myofibrils. More-damaged fibres show major myofibrillar abnormalities with disruption of the sarcomeres, which are replaced by remnants of myofibrils, and electron-dense material. Under electron microscopy, a matrix of granulofilamentous material is observed among the myofibrils (h and i). Stretching sensitizes the myofibrils to calcium and increases the force of cardiac contraction. Pathological changes consisted of a central zone of fibrosis surrounded by degenerate muscle myofibrils containing a variable number of polygonal sporophorous vesicles. An exception is formed by the outflow tract where the myofibrils show clear alignment. In addition to this smaller volume, myofibril arrangement seemed to be disturbed, when studied with confocal microscopy. Electron microscopical observation showed initial morphological changes including myofibril disturbance and swelling of mitochondria. Myofibril assembly is still poor in these stages. Inside these striated muscle cells are myofibrils, bundles of contractile proteins, which can be resolved into sarcomeres, the repeating structural elements which are the functional contractile units of the cell. The filaments are organized into repeated subunits along the length of the myofibril. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A myofibril-like structure and cross striations can be identified. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The term myofibril should not be confused with myofiber, which is a simply another name for a muscle cell. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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