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- W2040477003 abstract "1. When a nerve-muscle preparation is paralysed by tetrodotoxin, brief depolarizing pulses applied to a motor nerve ending cause packets of acetylcholine to be released and evoke end-plate potentials (e.p.p.s), provided calcium ions are present in the extracellular fluid.2. By ionophoretic discharge from a 1 M-CaCl(2) pipette, it is possible to produce a sudden increase in the local calcium concentration at the myoneural junction, at varying times before or after the depolarizing pulse.3. A brief application of calcium facilitates transmitter release if it occurs immediately before the depolarizing pulse. If the calcium pulse is applied a little later, during the period of the synaptic delay, it is ineffective.4. It is concluded that the utilization of external calcium ions at the neuromuscular junction is restricted to a brief period which barely outlasts the depolarization of the nerve ending, and which precedes the transmitter release itself.5. The suppressing effect of magnesium on transmitter release was studied by a similar method, with ionophoretic discharges from a 1 M-MgCl(2)-filled pipette. The results, though not quite as clear as with calcium, indicate that Mg pulses also are only effective if they precede the depolarizing pulses." @default.
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- W2040477003 date "1967-04-01" @default.
- W2040477003 modified "2023-10-18" @default.
- W2040477003 title "The timing of calcium action during neuromuscular transmission" @default.
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- W2040477003 doi "https://doi.org/10.1113/jphysiol.1967.sp008183" @default.
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