what is enzyme?

• What is ENZYMES?
• How it work on body?   
• => A complex protein produced by living cells that promotes a specific biochemical reaction by acting as a catalyst. Enzymes are catalysts, speeding up chemical reactions in cells, making reactions run to completion thousands if not millions of times more quickly than if the enzyme was absent. 
•  For example, carbonic anhydrase, which functions in red blood cells, is an enzyme that converts 600,000 molecules of carbon dioxide to 600,000 molecules of bicarbonate in ONE second.
•   The rate at which different enzymes convert substrate(s) to product(s) is highly variable, and this rate is also subject to change due to environmental conditions, such as temperature and the pH of the surrounding environment.  For example, rates of decomposition (a complex process whereby myriad chemical reactions occur, with associated enzymes) are much slower in colder climates than in warmer climates decomposition is also slowed if not stopped all together in the highly acidic environment of bogs. 
• An enzyme works on a substrate, which is then turned into a product (or products).  In one of the examples above, carbonic anhydrase is the enzyme, carbon dioxide is the substrate it works on, and bicarbonate is the resulting product.  In text, enzymes are easily recognizable, as they usually end in the suffix –ase.