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  • Title: Electrical membrane properties of the muscle lamellae in Branchiostoma myotomes.
    Author: Melzer W.
    Journal: Eur J Cell Biol; 1982 Oct; 28(2):213-8. PubMed ID: 7173220.
    Abstract:
    The membrane characteristics of amphioxus myotome cells were investigated using the chopped-current clamp method. The extremely thin myotome lamellae had a membrane resistance of 2.2 to 7.7 k omega cm2 and a capacity of 0.4 to 1.3 microF/micron2. The steady state current-voltage relation showed outward rectification. In Cl- - and Na+ -free solutions containing 400 mM TEA the input resistance and the time constant increased threefold and Ca2+ -dependent action potentials occurred, indicating the presence of a Ca2+ component in membrane current. It is discussed whether Ca2+ ions entering the cell during the normal action potential may significantly increase the intracellular free Ca2+ concentration.
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