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The Journal of General Physiology, Vol 81, 355-372, Copyright © 1983 by The Rockefeller University Press
ARTICLES |
RS Zucker and LO Lara-Estrella
The post-tetanic decay in miniature excitatory junction potential (MEJP) frequency and in facilitation of excitatory junction potentials (EJPs) was measured at crayfish neuromuscular junctions. A 2-s tetanus at 20 Hz caused the MEJP frequency to increase an average of 40 times and the EJP amplitude to increase an average of 13 times. Both MEJP frequency and EJP facilitation decayed with two time constants. The fast component of MEJP frequency decay was 47 ms, and that of EJP facilitation was 130 ms. The slow component of MEJP frequency decay was 0.57 s, and that of EJP facilitation was approximately 1 s. These results were consistent with the predictions of a residual calcium model, with a nonlinear relationship between presynaptic calcium concentration and transmitter release.
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