The fiber types are defined by which "myosinheavychains" (MHCs) they contain and by their metabolic capacity, a feature largely determined by the number of energy-producing mitochondria they house.
纤维类型取决于它们所含的肌球蛋白重链和它们的代谢能力，其所含产能线粒体的数量大大决定了其特征。
2
The two myosinheavychains are important components of the contractile apparatus?of the cardiomyocyte46.