<prompt> In glycogenolysis, adrenaline acts onGlucokinaseHexokinasePhosphorylaseNone of the above  <response>: Regulation of glycogen degradation by cAMP: The hormones like epinephrine and glucagon bring about glycogenolysis by their action on glycogen phosphorylase through cAMP. Glycogen phosphorylase exists in two forms, an active a form and inactive formb. 