For example, insulin is a protein hormone that helps regulate the blood glucose level.
Hormones are chemical-signaling molecules, usually small proteins or steroids, secreted by endocrine cells that act to control or regulate specific physiological processes, including growth, development, metabolism, and reproduction. An example of an enzyme is salivary amylase, which hydrolyzes its substrate amylose, a component of starch. Note that all enzymes increase the reaction rate and, therefore, are organic catalysts. Those that build more complex molecules from their substrates are anabolic enzymes, and enzymes that affect the rate of reaction are catalytic enzymes. We call enzymes that break down their substrates catabolic enzymes. The enzyme may help in breakdown, rearrangement, or synthesis reactions. Each enzyme is specific for the substrate (a reactant that binds to an enzyme) upon which it acts. Enzymes, which living cells produce, are catalysts in biochemical reactions (like digestion) and are usually complex or conjugated proteins.
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