Metabolic reactions are the chemical processes that occur within living organisms to maintain life. These reactions involve converting food into energy, building and repairing tissues, and regulating bodily functions. They can be categorized into two main types: catabolic reactions, which break down molecules to release energy, and anabolic reactions, which use energy to build complex molecules. These reactions are essential for growth, reproduction, and response to environmental changes. Enzymes, which are specialized proteins, facilitate metabolic reactions by speeding up the chemical processes. Overall, metabolic reactions are crucial for sustaining life and ensuring that organisms function properly.