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Anatomy Atlases: Atlas of Microscopic Anatomy: Section 1 - Cells Atlas of Microscopic Anatomy: Section 5 - Muscular Tissue

Plate 5.72: Striated Muscle

Semitendinosus, cross section
Mitochondria; succinic dehydrogenase localization

Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger, Jr., Ph.D.
Peer Review Status: Externally Peer Reviewed


STRIATED MUSCLE
Semitendinosus, cross section
Mitochondria; succinic dehydrogenase localization

Plate 5.72: Striated Muscle

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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