Abstract
FAST and slow contracting mammalian muscles differ considerably in their biochemical properties, for example, in their enzyme activity, reflecting especially different quantitative proportions of glycolytic (extramitochondrial) and respiratory (mitochondrial) systems1, ATPase activity of myosin2, ionic content3,4 and many other biochemical characteristics. Avian muscles are especially suitable for the investigation of biochemical differences of fast and slow muscle fibres, as whole muscles consist exclusively of each type of fibre5,6. Little is known of the metabolic differences between fast and slow muscle fibres of birds in which, unlike mammalian muscle fibres, there are also basic structural and electrophysiological differences of fast (phasic) and slow (tonic) muscle fibres, which differ as in frogs according to “fibrillen” or “felderstruktur”5,7, focal or multiple innervation, sensitivity to acetylcholine8 and capacity for long-term contraction9. Both fast and slow contracting mammalian muscles are phasic and do not show such basic structural and electrophysiological differences.
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SYROVÝ, I., GUTMANN, E. Metabolic Differentiation of the Anterior and Posterior Latissimus Dorsi of the Chick during Development. Nature 213, 937–938 (1967). https://doi.org/10.1038/213937a0
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DOI: https://doi.org/10.1038/213937a0
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