All increases serum glucose except
a. Serum glucose either increase by glycogenolysis (break down of glycogen) or Gluconeogenesis
b. Activity of enzymes of gluconeogenesis — is increased by Gluco-corticoids, glucagon, Epinephrine (cAMP)
c. Activity of phosphorylase → 1st enzyme (Rate limiting step) in glycogenolysis → its activity is increased by →cAMP — by activity of Adenyl cyclase →by norepinephrine, Epinephrine, glucagon.