[Comparative characteristics of depolarization (potassium) and acetylcholine contracture of Lampetra fluviatilis lamprey phasic muscle].
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.
D000109:Acetylcholine / Q000494:pharmacology*; D000818:Animals; D005399:Fishes; D007798:Lampreys; D008564:Membrane Potentials / Q000187:drug effects; D009119:Muscle Contraction / Q000187:drug effects*; D009132:Muscles / Q000187:drug effects; D011188:Potassium / Q000494:pharmacology*; D011930:Reaction Time / Q000187:drug effects; D013268:Stimulation, Chemical
D000109:Acetylcholine; D011188:Potassium
Sravnitel'naia kharakteristika depoliarizatsionnoĭ (kalievoĭ) i atsetilkholinovoĭ kontraktur faznoĭ myshtsy minogi Lampetra fluviatilis.