“Adrenergic antagonists such as dl-…(-8)-10(-6) M), oxprenolol (10(-8)-10(-6) M), and practolol (10(-…(-4) M) blocked equally the inhibition of alanine and glutamine release, prevented the stimulations of muscle cAMP levels, phosphosphorylase a … the depletion of muscle glycogen produced by either epinephrine or serotonin.”