In glycogenolysis, adrenaline acts on: (A) Glucokinase, (B) Hexokinase, (C) Phosphorylase, (D) None of the above
Answer is C. 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 form'b'.