Abstract
Noradrenaline causes a significant increase in the amplitude of multiquantum end-plate currents (EPC) and also diminishes the EPC rising phase vs the rising phase of the miniature EPC ratio in the frog neuromuscular junction under conditions of low-frequency long-lasting stimulation of the motor nerve. Noradrenaline changes the kinetics of transmitter release due to synchronization of the quantum transmitter secretion. The synchronizing action of noradrenaline can underlie its de-fatiguing effect in the neuromuscular junction.
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