The function of glycogen phosphorylase is: question options: a. the conversion of glucose-1-phosphate to glucose-6-phosphate. b. inhibit the production of glucose-1-phosphate. c. to breakdown atp. d. stimulate the buildup of glycogen. e. catalyze the phosphorolysis of glucose-1-phosphate from glycogen molecules.

             The correct option is e (catalyze the phosphorolysis of glucose-1-phosphate from glycogen molecules).

Reason:
              It is that type of enzyme which is responsible for the conversion of glycogen into glucose through a series of reactions. First of all glycogen is converted to glucose 1-phosphate catalysed by glycogen phosphorylase. It is then converted into glucose 6-phosphate with the help of phosphoglucomutase. In liver it is then converted into glucose which enter into blood stream.
I hope it will help you. If not then look at diagram you will easily understand the phenomenon. 

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