2. The glycogen phosphorylase isozymes in muscle and liver are regulated and differently ◆肌糖原和肝糖原的生理功能不同:前者主要是 氧化供能( oxidative degradation to generate ATP for muscle),而肝糖原主要用于维持血 糖浓度( producing and exporting glucose when in demand and importing and storing When in excess ◆肌糖原磷酸化酶和肝糖原磷酸化酶为同工酶 者的活性均受磷酸化(cata! yzed by specific phosphorylase b kinase)和脱磷酸 catalyzed by specific phosphorylase a phosphatase)共价可逆调控2. The glycogen phosphorylase isozymes in muscle and liver are regulated and differently ◆肌糖原和肝糖原的生理功能不同：前者主要是 氧化供能（ oxidative degradation to generate ATP for muscle ），而肝糖原主要用于维持血 糖浓度（producing and exporting glucose when in demand and importing and storing when in excess）. ◆ 肌糖原磷酸化酶和肝糖原磷酸化酶为同工酶， 二者的活性均受磷酸化（ catalyzed by specific phosphorylase b kinase ）和脱磷酸 （ catalyzed by specific phosphorylase a phosphatase ）共价可逆调控