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myofibril

   Also found in: Medical, Encyclopedia, Wikipedia 0.01 sec.
my·o·fi·bril  (m-fbrl, -fbrl)
n.
Any of the threadlike fibrils that make up the contractile part of a striated muscle fiber. Also called sarcostyle.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.myofibril - one of many contractile filaments that make up a striated muscle fiber
sarcoplasm - the cytoplasm of a striated muscle fiber
striated muscle cell, striated muscle fiber - an elongated contractile cell in striated muscle tissue
sarcomere - one of the segments into which a myofibril is divided
fibril, filament, strand - a very slender natural or synthetic fiber


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In addition, selenium deficiency can cause a painful myopathy with thinned myofibrils, vacuolization without fibrosis, and mitochondrial abnormalities.
Kinetic studies The main role of different isoenzymes of CK in cardiac muscle is to form a 'creatine shuttle', which means that the ATP synthesized in the mitochondrial matrix is used by MtCK for the synthesis of PCr in the mitochondrial intermembrane space to form a new energy-rich phosphoryl product; PCr then enters the cytoplasm and is transported to the myofibril by a facilitated diffusion mechanism.
When this happens our bodies will repair damage by adding new muscle tissue, increasing the number and size of myofibrils per muscle fiber, increasing the number of contractile proteins (actin and myosin), and increase the enzymes and stored nutrients within the cells, thus causing the size of the muscle cells to increase.
 
 
 
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