In the experiment, the experimental animal was fed only food containing proteins and not containing carbohydrates

In the experiment, the experimental animal was fed only food containing proteins and not containing carbohydrates. After the death of the animal, glycogen was found in its liver. What is glycogen? Explain its origin.

1. Glycogen is a polysaccharide formed by glucose residues, the main storage carbohydrate in animals. Glycogen forms an energy reserve that can be quickly mobilized if necessary to make up for a sudden lack of glucose. Only glycogen stored in liver cells can be converted into glucose to feed the entire body.
2. In the process of metabolism, carbohydrates can be formed from proteins, which happened to the experimental animal, which was fed only protein food. This is the case with people who eat mainly animal food, for example, among the peoples of the north.