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Endorphins
http://en.wikipedia.org/wiki/Endorphins

Endorphins ("endogenous morphine") are endogenous
opioid inhibitory neuropeptides. They are produced
by the central nervous system and pituitary gland.
The term implies a pharmacological activity
(analogous to the activity of the
corticosteroid category of biochemicals)
as opposed to a specific chemical formulation.
It consists of two parts: endo- and -orphin;
these are short forms of the words endogenous
and morphine, intended to
mean "a morphine-like substance originating
from within the body."



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