How Glycogen Is Produced and Degraded

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Control of carbohydrate metabolism is important in physical activity of all sorts. 

4 Glucose Is Sometimes Diverted through the Pentose Phosphate Pathway 

Chapter 18 Storage Mechanisms and Control in Carbohydrate Metabolism 

Three reactions play roles in the conversion of glycogen to glucose-6-phosphate. In the first reaction, each glucose residue cleaved from glycogen reacts with phosphate to give glucose-l-phosphate. Note particularly that this cleavage reaction is one of phosphorolysis rather than hydrolysis. 

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