How do enzymes in the body affect chemical reactions?

providing an alternate pathway with a lower activation energy
increasing the surface area of the reactants
increasing the temperature of the system
providing an alternate pathway with a higher activation energy

providing an alternate pathway with a lower activation energy. Enzymes act as catalysts that lower the activation energy required for a chemical reaction to occur, thus making the reaction happen more quickly and efficiently. This means that enzymes speed up chemical reactions that take place in the body, such as breaking down food into nutrients and producing energy.