Answer
catalyst, enzymes
Work Step by Step
Any substance that increases the rate of a reaction without being consumed by it is a catalyst. In the human body, enzymes serve this function.
Catalysts are substances that temporarily bind to reactants and hold them in a favorable position for a reaction to occur. Catalysts speed up reactions by reducing the activation energy required.
Enzymes are proteins that function as biological catalysts in the body. Enzymes are important because they allow for chemical reactions to occur at normal body temperature and conditions.
