There are several components, including catalysts, heat and pressure, that when added to chemicals and chemical reactions incite or speed up the reaction process. One of the most helpful biological additives in chemical reactions are enzymes.
Chemical reactions are set off by increased temperature, pressure, concentration of compounds and surface area. An increase of any one of these components, regardless of whether or not it is what began the reaction, helps ensure the longevity and speed up the reaction process. In biological organisms, such as humans and other animals, enzymes are an important type of catalyst that reduce the amount of energy needed for reactions to occur, thus allowing reactions to occur faster and more frequently.