Semitendinosus, cross section
Mitochondria; succinic dehydrogenase localization
Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger,
Peer Review Status: Externally Peer Reviewed
Rat, frozen section, Tetrazolium method, 612 x.
Histochemical methods similar to the one used here, which is specific for mitochrondria, have been instrumental in distinguishing muscle fiber types in health and disease.
Red muscle fiber (B fiber): Rich in mitochondria and lipids, this type of fiber is slow contracting. Known in the human as Type I muscle fiber.
White muscle fiber (A fiber): Relatively poor in mitochondria and lipids, but rich in myofibrillar ATPase activity and glycogen, these fibers are fast contracting. Known in the human as Type II muscle fiber.
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