Geographic Concepts. The Census Bureauâs urban-rural classification is fundamentally a delineation of geographical areas, identifying both individual urban areas and the rural areas of the nation.
Glycogen is a polysaccharide molecule stored in animal cells along with water and used as a source of energy. When broken down in the body, it is transformed into glucose, an important source of energy for animals. In animals, it plays a role similar to that played by starch in plants.
By Laura Dolson. Updated May 09, 2016. Definition: Glycogen is the main way the body stores glucose for later use. Since most of the carbohydrate we eat ends up as glucose, it's important to be able to store some of it to control blood glucose levels and provide glucose to the parts of the body that need it. Glycogen molecules are that storage.