Hormones are chemicals released by cells, glands or organs to send signals which affect the way the body works. A small amount of hormones makes a big difference. Essentially, hormones are chemical messages sent by the body as signals.
There are two types of hormones: endocrine hormones and exocrine hormones. Endocrine hormones are released directly into the bloodstream from glands or cells, while exocrine hormones are secreted into a duct and transported to the bloodstream, or diffused from one cell to another by the process of paracrine signalling.
Hormones are used to stimulate growth, repair, regulation of processes and controlling of the rate of certain activities within the body. Although they cannot be seen with the naked eye, hormones play an important role in the human system.
Sources:
http://en.wikipedia.org/wiki/Hormone
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