Metabolic structures refer to the various components within cells that facilitate metabolic processes, which are the chemical reactions that convert food into energy. These structures include organelles like mitochondria, where energy production occurs, and ribosomes, which synthesize proteins essential for cellular functions. Additionally, metabolic structures encompass enzymes, which are proteins that speed up chemical reactions, and pathways like glycolysis and the Krebs cycle, which are sequences of reactions that break down glucose and produce energy. Together, these components work in harmony to maintain cellular health and support life.