A histochemical study of the red and white muscle fibers Part II. Activity of the cytochrome oxidase in muscle fibers

From the histochemical studies of cytocyrome oxidase on the striated muscles of the cats and mice, the following results have been obtained. The three types of muscle fibers are distinguishable by the activity of cytochrome oxidase from each other as by the succinic dehydrogenase activity, namely, the red muscle fibers show a high cytochrome oxidase activity, the medium fibers a moderate activity, and the white muscle fibers a low activity. And it is suggested that these three types of fibers are different in their respiration, metabolism and have the different functions.