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Agonists associated with the α1, α2 and β1 adrenoreceptors decrease spontaneous release. Activation for the α2 and β1 adrenoreceptors reduces the sheer number of acetylcholine quanta circulated in response to a nerve stimulation (quantal content), but an agonist of the β2 receptors increases quantal content. Activation of α2 and β2 adrenoreceptors alters the kinetics of acetylcholine quantal launch by desynchronizing the neurosecretory process. Certain blockers of the receptors get