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A hormone (from Greek horman - "to set in motion") is a chemical messenger from one cell (or group of cells) to another. All multicellular organisms produce hormones (including plants - see article phytohormone).

The best-known animal hormones are those produced by endocrine glands of vertebrate animals, but hormones are produced by nearly every organ system and tissue type in an animal body. Hormone molecules are secreted (released) directly into the bloodstream; some hormones, called ectohormones, aren't secreted into the blood stream, they move by circulation or diffusion to their target cells, which may be nearby cells (paracrine action) in the same tissue or cells of a distant organ of the body. The function of hormones is to serve as a signal to the target cells; the action of hormones is determined by the pattern of secretion and the signal transduction of the receiving tissue.

Hormone actions vary widely, but can include stimulation or inhibition of growth, induction or suppression of apoptosis (programmed cell death), activation or inhibition of the immune system, regulating metabolism and preparation for a new activity (e.g., fighting, fleeing, mating) or phase of life (e.g., puberty, caring for offspring, menopause). 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. Hormones also control the reproductive cycle of virtually all multicellular organisms.

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hormones hve made me into a carb-whore.
anjaleef (Anja Lee) Sat, 07 Nov 2009 03:26:09 -0000
hormones hve made me into a carb-whore.
RT @hornication @Queerbunni no just horny> had that same affliction since childbirth #damn #hormones
MaryJJohns (Mary Wilkins Johns) Sat, 07 Nov 2009 03:22:58 -0000
RT @hornication @Queerbunni no just horny> had that same affliction since childbirth #damn #hormones
Glow-in-the-Dark Shark Turned on by Hormones | Wired Science | Wired.com http://ow.ly/1601SV
PersonaPro (Persona Personified) Sat, 07 Nov 2009 03:22:16 -0000
Glow-in-the-Dark Shark Turned on by Hormones | Wired Science | Wired.com http://ow.ly/1601SV
Glow-in-the-Dark Shark Turned on by Hormones | Wired Science | Wired.com http://ow.ly/1601SU
MnSDyak (MnS D. Yak) Sat, 07 Nov 2009 03:22:16 -0000
Glow-in-the-Dark Shark Turned on by Hormones | Wired Science | Wired.com http://ow.ly/1601SU
I was hoping today would be the first day in a while I could get through without crying, but nope, not going to be today. Damn hormones.
stesha (Stephanie Hart) Sat, 07 Nov 2009 03:10:32 -0000
I was hoping today would be the first day in a while I could get through without crying, but nope, not going to be today. Damn hormones.
Blah. Had a moment at the show. Stupid hormones!
asdfJESSkl (Jessica Slupe) Sat, 07 Nov 2009 03:07:25 -0000
Blah. Had a moment at the show. Stupid hormones!

 
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