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  • Title: Potassium-induced depolarizations and generation of tension in barnacle muscle fibres: effects of external calcium, strontium and barium.
    Author: Luxoro M, Nassar-Gentina V.
    Journal: Q J Exp Physiol; 1984 Apr; 69(2):235-43. PubMed ID: 6729014.
    Abstract:
    Potassium-induced contractions were studied in muscle fibres from Megabalanus psittacus (Darwin) in an attempt to establish the requirement of extracellular calcium for the development of force. A sudden elevation of external potassium induced the production of contractures and/or twitches only if calcium was present. In calcium-free solutions no contraction or action potential occurred. When external calcium was replaced by barium, potassium-induced depolarizations accompanied by several action potentials did not generate either contractures or twitches. With strontium in place of calcium, action potentials of different duration were observed. Only the long-lasting ones (a few seconds) induced twitches.
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