Endocrine system (endocrine system), of cells and organs to communicate with each other and co-ordination (coordinate) to work and protect the internal environment, difficult to extensive external and internal (stresses) provide appropriate responses to, growth and to produce a system which is controlled. Endocrine glands produce substances called hormones, and they aim to influence them through their messages to target cells (message) They send.
Hormones in the Greek word “activate”, “goad” made from a verb meaning. Hormones, by one or a group of cells secreted into the body fluids and functional supervision over other body cells, showing effects of chemicals are.
Endocrine effects in the traditional sense, hormones into the blood stream and sends a message to a remote target cells occurs via. However, today these hormones and hormone-producing cells may also affect the neighboring cells (paracrine effects), even self-produced hormone-producing cells may affect (autocrine effect) It is known that.
Hormones are divided into four groups according to their chemical structure.
Steroid hormones (The most famous of : cortisol, progesterone, testosterone,)
Peptide hormones (The most famous of: Insulin, Growth hormone, prolactin, thyroid )
Amino acids, hormones (The most famous of: Adrenaline, melatonin, dopamine)
Lipid-derived hormones (The most famous of: endorphin, enkefalin).
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