Final answer:
Glycogen synthesis involves the addition of glucose residues to the glycogen primer, which is then elongated and becomes a substrate for glycogen synthase. Glycogenolysis is the breakdown of glycogen, and it is catalyzed by glycogen phosphorylase.
Step-by-step explanation:
Glycogen synthesis is the process where glycogen synthase adds glucose residues to the glycogen primer. Initially, the primer is elongated by about 8 glucose residues. Once it reaches this length, it becomes a substrate for glycogen synthase to add more glucose residues, forming a linear chain. This process continues until glycogenesis is completed. Glycogenolysis, on the other hand, is the breakdown of glycogen, and it involves the action of the enzyme glycogen phosphorylase.