Differentiation of electrical and contractile properties of slow and fast muscle fibres.
The Journal of PhysiologyPublished 1 August 1977Open access
Tessa Gordon, Robert D. Purves, Gerta Vrbovà
Citations50
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TL;DR
It is suggested that the different electrical properties of the membrane of the two types of muscle fibre develop as a result of the particular type of excitation imposed by their nerves.
Abstract
1. The development of the electrical and contractile properties of slow anterior latissimus dorsi (ALD) and fast posterior latissimus dorsi (PLD) muscles of the chick was studied. 2. At the earliest ages studied (14-16 days of incubation), the membrane resistance was similar in both muscles. Subsequently the membrane resistance of PLD decreased, and that of ALD increased. Electrical differentiation continued after hatching. 3. The contractile speeds of ALD and PLD muscles were similar in embryos at 14-16 days of incubation, and suddenly differentiated at 17-18 days. Unlike the electrical properties, contractile speeds changed little after hatching. 4. It is suggested that the different electrical properties of the membrane of the two types of muscle fibre develop as a result of the particular type of excitation imposed by their nerves.
Keywords
Materials ScienceAgricultural and Biological SciencesBiochemistry, Genetics and Molecular Biology
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