Role of Calcium Ions in Neuromuscular Transmission

  • R. Rahamimoff
Part of the Biological Council book series

Abstract

The important role of calcium ions in neuromuscular transmission was recognized three-quarters of a century ago (Locke, 1894). If a neuromuscular preparation of the frog is immersed in normal Ringer solution, an adequate stimulus to the nerve produces a twitch. When the calcium concentration in the medium is reduced to, say, one-eighth of the normal, a similar stimulus produces no mechanical response. If the effect of partial or total calcium deprivation is examined on the various steps leading from the nerve stimulus to muscle contraction, almost every stage, depending on the experimental conditions and the time of exposure, is found to be affected to some extent: the initiation of the action potential, its conduction along the nerve (Frankenhauser & Hodgkin, 1957; Frankenhauser, 1957), the release of the transmitter from the motor nerve terminal (Katz & Miledi, 1965a), the reaction of the transmitter with the postsynaptic membrane (Takeuchi & Takeuchi, 1962; Nastuk & Liu, 1966), the generation of the action potential in the muscle, and finally the contraction of the muscle (see Sandow, 1965). It appears, however, that the link which is most sensitive to reduction of external calcium is the nerve terminal.

Keywords

Magnesium CaCl2 Barium Acetylcholine Glycoside 

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Copyright information

© Palgrave Macmillan, a division of Macmillan Publishers Limited 1970

Authors and Affiliations

  • R. Rahamimoff
    • 1
  1. 1.Department of PhysiologyHebrew University, Hadassah Medical SchoolJerusalemIsrael

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