The Journal of General Physiology
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*CALCIUM COMPOUNDS
*CALCIUM, ELEMENTAL
*MAGNESIUM COMPOUNDS
*MAGNESIUM, ELEMENTAL
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The Journal of General Physiology, Vol 49, 807-818, Copyright © 1966 by The Rockefeller University Press

ARTICLE

Effects of the Intracellular Ca Ion Concentration upon the Excitability of the Muscle Fiber Membrane of a Barnacle

Susumu Hagiwara 1 and Shigehiro Nakajima 1

1 From the Department of Zoology and Brain Research Institute, University of California at Los Angeles.

Dr. Hagiwara's present address is the Marine Neurobiology Facility and Department of Marine Biology, Scripps Institution of Oceanography, University of California at San Diego, La Jolla. Dr. Nakajima's present address is the Department of Physiology, Juntendo University, Medical College, Bunkyo-ku, Tokyo, Japan

The membrane excitability and contraction were examined in single barnacle muscle fibers with different internal Ca++ concentrations by using buffer solutions made up with EGTA and Ca-gluconate in various proportions. During the passage of dc currents the membrane shows all-or-none spike potentials for internal Ca++ concentrations below about 8 x 10-8 M, oscillatory potential changes in the range between 8 x 10-8 to 5 x 10-7 M, but neither oscillatory nor spike potentials were seen for concentrations above 5 x 10-7 M. All-or-none spike potentials were suppressed when the internal Mg++ concentration exceeded 5 mM. The suppression threshold of the internal Ca++ concentration for the Sr spike is much higher than that for the Ca spike. The threshold concentration of internal Ca++ for contraction was about 8 x 10-7 M.

Submitted on June 25, 1965


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