The primary function of enzymes in the body is to act as biological catalysts, speeding up chemical reactions essential for various bodily functions. Enzymes are proteins that lower the activation energy required for reactions, ensuring that metabolic processes, digestion, and other cellular activities occur at a rate necessary for life. Each enzyme is specific to a particular reaction or substrate, allowing for highly regulated biochemical pathways. Without enzymes, metabolic reactions would proceed too slowly to sustain life, highlighting their critical role in maintaining health and supporting various physiological processes in the body.