What are the functions of enzymes?

Enzymes are biological catalysts that perform a number of functions in our body. 

The primary function of enzymes is to speed up the rate of all chemical reactions that occur within cells. They do this by lowering the amount of energy required for a reaction to occur, also known as the activation energy of a reaction. 

Some enzymes are involved in breaking down large molecules into smaller substances that can be more easily absorbed by the body. Other enzymes catalyze the binding of two molecules to produce a new molecule. 

Enzymes such as ATP synthase play a key role in generating energy in the body. Other enzymes play key roles in other biochemical reactions such as hydrolysis, oxidation, and reduction among others. They also facilitate the movement of ions across the plasma membrane.

Enzymes such as protein kinase, facilitate signal transduction by catalyzing the phosphorylation of proteins.