Inhibitory effects of cholinergic agents on the release of transmitter at the frog neuromuscular junction.
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چکیده
منابع مشابه
Structural changes after transmitter release at the frog neuromuscular junction
The sequence of structural changes that occur during synaptic vesicle exocytosis was studied by quick-freezing muscles at different intervals after stimulating their nerves, in the presence of 4-aminopyridine to increase the number of transmitter quanta released by each stimulus. Vesicle openings began to appear at the active zones of the intramuscular nerves within 3-4 ms after a single stimul...
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Phenobarbital (1-2 × 10(-4)M) markedly increases the frequency of miniature end-plate potentials at the neuromuscular synapse of the frog. This effect was seen in calcium free media containing EGTA. The drug probably acts presynaptically at an intracellular locus to increase the presynaptic free calcium concentration.
متن کاملEffects of changes in motor unit size on transmitter release at the frog neuromuscular junction.
The dependence of transmitter release and synaptic effectiveness on the size of a neuron's peripheral field was studied using neuromuscular junctions in sartorius muscles of adult frogs (Rana pipiens). The size of the peripheral field (motor unit size) was reduced by crushing the sartorius nerve and surgically removing half of the muscle fibers. Synapses thus formed were compared with those for...
متن کاملTransmitter release at the neuromuscular junction.
NATIONAL REVIEW OF 105 OBIOLOGY, VOL. 75 Copyright 2006, Elsev All rights re 0.1016/S0074-7742(06)75006-1 0074-7742/06 II. P hysiological Properties of Transmitter Release III. E xperimental Advantages and Limitations of the Fly NMJ A. C a2þ Measurements B. D ye Loading C. A lternative Measures of Exocytosis IV. H ow Do Vesicles Fuse: Full Fusion or Kiss-and-Run? V. C ore Machinery of Exocytosi...
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the following null hypothesis was proposed: there is no significant difference between the efl students listening comprehension development receiving pictorial cues and those receiving no cuse. to test the null hypothesis, 52 male and femal freshmen students of medicine studing at iran university of medical scinces were randomly selected from a total population of 72 students. to ensure that th...
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ژورنال
عنوان ژورنال: The Journal of Physiology
سال: 1979
ISSN: 0022-3751
DOI: 10.1113/jphysiol.1979.sp012917