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  • Title: [Comparative characteristics of depolarization (potassium) and acetylcholine contracture of Lampetra fluviatilis lamprey phasic muscle].
    Author: Skorobovichuk NF, Nasledov GA.
    Journal: Zh Evol Biokhim Fiziol; 1978; 14(6):576-80. PubMed ID: 735598.
    Abstract:
    Acetylcholine (Ach) contractures of thin bundle from m. longitudinal linguae of the lamprey differs by several parameters from depolarization (potassium) contracture, although Ach similar to K ions totally depolarizes the surface membrane of muscle fibers. Maximum tension of Ach contracture is 30--100% higher than that of K contracture, maximum of both contractures being observed at the same membrane potential level (approximately -10mV). The rate of rise of Ach contracture is 10 times higher, whereas the latent period is 3 times shorter as compared with the same parameters of K contracture. At higher Ach concentrations (10(-5)--10(-4) g/ml) the latent period of contracture is shorter than that of depolarization.
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