Effect of atropine on the decay of miniature end-plate currents at the frog neuromuscular junction.

1 The effect of atropine on the time constant of decay (tau) of miniature end-plate currents was investigated. 2. The atropine-induced shortening of tau was accompanied by a reduction in the voltage-sensitivity of tau. 3. This effect of atropine was reversible and dose-dependent, the voltage sensitivity being abolished with high concentrations of atropine (2.5 X 10(-5)M).