enkephalins

Scientists eventually discovered that people make their own opioids, called enkephalins and endorphins.

Cannabinoids, Wonder Drugs of the 21st Century 2009

And researchers have shown that this triggers the release of pain-relieving and mood-boosting brain chemicals called enkephalins and beta-endorphins.

Boston.com Top Stories 2011

Also, exercise leads to the release of endorphins and possibly enkephalins that are partly responsible for the "high" that one may experience with exercise.

Srinivasan Pillay: Dealing With Recession Panic: The Science of Physical Exercise 2009

The stimulation of these endigs has an influence on the nervous system in order to release some natural painkilling chemicals such as endorphins, enkephalins and neural hormones as: serotonin, endorphins, catecholamines, cortisol, and adrenaline.

Alternative Therapies: Acupuncture -How Does the Acupuncture Help? 2008

But at the same time, it opens the dam on endogenous opioids such as endorphins and enkephalins to keep us calm and numb our pain.

Think Progress » O’Reilly Revives The War On Christmas 2006

The existence of the receptor suggested that the brain produced its own endogenous opiate, and sure enough within a few years scientists had discovered two of them: the enkephalins and the endorphins—meaning “in the head” and “morphine within,” respectively.

Mind Wide Open Steven Johnson 2004

From all this, it is tempting to hypothesize that one reason certain people become addicted to external opiates i.e., alkaloids, such as morphine and heroin, that can bind to opiate receptors is because they are able to artificially induce feelings of gratification similar to that normally achieved by the socially induced release of endogenous opioids such as endorphins and enkephalins.

Mind Wide Open Steven Johnson 2004

From all this, it is tempting to hypothesize that one reason certain people become addicted to external opiates i.e., alkaloids, such as morphine and heroin, that can bind to opiate receptors is because they are able to artificially induce feelings of gratification similar to that normally achieved by the socially induced release of endogenous opioids such as endorphins and enkephalins.

Mind Wide Open Steven Johnson 2004

The existence of the receptor suggested that the brain produced its own endogenous opiate, and sure enough within a few years scientists had discovered two of them: the enkephalins and the endorphins—meaning “in the head” and “morphine within,” respectively.

Mind Wide Open Steven Johnson 2004

From all this, it is tempting to hypothesize that one reason certain people become addicted to external opiates i.e., alkaloids, such as morphine and heroin, that can bind to opiate receptors is because they are able to artificially induce feelings of gratification similar to that normally achieved by the socially induced release of endogenous opioids such as endorphins and enkephalins.

Mind Wide Open Steven Johnson 2004