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The cleavage of terminal glycogen residue forms glucose-1-phosphate, which further converted to glucose-6-phosphate by phosphoglucomutase. Glucose-6-phosphate is used directly for glycolysis in muscle while in liver it decomposed toglucose during low glucose level. The complete degradation of glycogen requires the action of a second bifunctional enzyme known as debranching enzyme like oligo ($\alpha $-1,4 -->$\alpha $-1,4) glucantransferase. Hence glycogen degradation process completed in three steps. The conversion of glycogen to glucose 1-phosphate.