The process of creating glycogen from glucose is known as glycogenesis.
Glycogenesis happens when blood glucose levels are high enough for extra glucose to be stored in the liver and muscle tissue.
Glucose phosphorylation, the initial stage of glycogenesis, converts glucose to Glucose-6-phosphate.
Later, Glucose-6-phosphate is converted to Glucose-1-phosphate.
In the third step of glucose activation, glucose-1-phosphate reacts with high-energy nucleotide uridine triphosphate (UTP) giving uridine diphosphate glucose (UDPG) and pyrophosphate.
In the fourth step, the UDPG-activated glucose is transferred to the already present glycogen.
Glycogen is synthesized by the joint action of glycogen synthase and the branching enzyme.
Glycogenesis is an anabolic process and requires energy.