title: Changes in statistical parameters during facilitation at the crayfish neuromuscular junction.
abstract: 1. Transmitter release at excitatory neuromuscular junctions of the crayfish was studied at different frequencies of stimulation ranging from 1/sec to 20/sec.2. Over this frequency range the average number of quanta released per stimulus (m) increased with frequency by a factor of 6-7.3. Analysis of the fluctuations in quantal release using binomial statistics indicated that the increase in m was associated with increase in the average quantal release probability (p) at stimulation frequencies between 5/sec and 20/sec. Between 1/sec and 5/sec there was an apparent increase in the number of quanta available for release (n).
mesh_terms: D000818:Animals; D003400:Astacoidea; D004558:Electric Stimulation; D004594:Electrophysiology; D066298:In Vitro Techniques; D009469:Neuromuscular Junction / Q000378:metabolism / Q000502:physiology*; D018377:Neurotransmitter Agents / Q000378:metabolism; D011336:Probability; D012636:Secretory Rate; D009435:Synaptic Transmission
chemical_list: D018377:Neurotransmitter Agents