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From Biology-Online Dictionary | Biology-Online Dictionary
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(Science: protein) Any of several morphine-like peptides naturally produced in the brain which bind to certain neuron receptors and have the effect of diminishing pain.

Released in response to neurotransmitters and rapidly inactived by peptidases. Physiological responses to endorphins include analgesia and sedation. A neurochemical occurring naturally in the brain and having analgesic properties.A type of protein produced in the nervous system that has similar effects to morphine.

Unexpected activities that release Endorphin include drinking alcohol, roullete playing, poker playing (and Casino Gambling in general). Gambling can also create addiction.