单词	myofibril
释义	myofibril /ˌmʌɪə(ʊ)ˈfʌɪbrɪl / noun Any of the elongated contractile threads found in striated muscle cells.In cross section, skeletal muscle fibers are seen to be composed of numerous small aggregates of contractile substance, the myofibrils.... Briefly, the cardiac myofibrils are composed of the major contractile proteins, actin and myosin. Individual muscle cells are extremely elongated and enclose many-stranded cables woven from threads called myofibrils.
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