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1. "Medicine Plus: "Hormones are your body's chemical messengers. They travel in your bloodstream to tissues or organs. They work slowly, over time, and affect many different processes, including.; Growth and development, Metabolism - how your body gets energy from the foods you eat, Sexual function, Reproduction, Mood - Endocrine glands, which are special groups of cells, make hormones. The major endocrine glands are the pituitary, pineal, thymus, thyroid, adrenal glands and pancreas. In addition, men produce hormones in their testes and women produce them in their ovaries. Hormones are powerful. It takes only a tiny amount to cause big changes in cells or even your whole body. That is why too much or too little of a certain hormone can be serious. Laboratory tests can measure the hormone levels in your blood, urine or saliva. Your health care provider may perform these tests if you have symptoms of a hormone disorder. Home pregnancy tests are similar - they test for pregnancy hormones in your urine....In the United States, the most common endocrine disease is diabetes. There are many others. They are usually treated by controlling how much hormone your body makes. Hormone supplements can help if the problem is too little of a hormone." (1)

2. "Wikipeda: "A hormone (from Greek ??µ? - "to set in motion") is a chemical messenger that carries a signal from one cell (or group of cells) to another via the blood. All multicellular organisms produce hormones (including plants - see phytohormone).[1][2]. In general, hormones regulate the function of their target cells, i.e., cells that express a receptor for the hormone. The action, or net effect of hormones is determined by a number of factors including its pattern of secretion and the response of the receiving tissue - the signal transduction response. Endocrine hormone molecules are secreted (released) directly into the bloodstream, while exocrine hormones (or ectohormones) are secreted directly into a duct, and from the duct they either flow into the bloodstream or they flow from cell to cell by diffusion in a process known as paracrine...Hormone effects vary widely, but can include:

* stimulation or inhibition of growth,
* In puberty hormones can effect mood and mind
* induction or suppression of apoptosis (programmed cell death)
* activation or inhibition of the immune system
* regulating metabolism
* preparation for a new activity (e.g., fighting, fleeing, mating)
* preparation for a new phase of life (e.g., puberty, caring for offspring, menopause)
* controlling the reproductive cycle

In many cases, one hormone may regulate the production and release of other hormones. Many of the responses to hormone signals can be described as serving to regulate metabolic activity of an organ or tissue." (2)

3. "There are two kinds of hormones 1. proteins, peptides, and modified amino acids.  2. steroids. (3)