Summary
The problem of the presence in mammals of specialized muscular fibers adjusted to tonic or tetanic activity is debatable. Experiments were performed in order to investigate this question.
Single muscular fibers were isolated from the muscles of mammals. It was established that specialized muscular fibers, contracting tonically or tetanically are present in rat muscle. Fibers of the transitional type combining both functions were also found.
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Chetverikov, G.N. The problem of specialized muscle fibers in mammals. Bull Exp Biol Med 45, 373–375 (1958). https://doi.org/10.1007/BF00803351
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DOI: https://doi.org/10.1007/BF00803351