Sharing is not just caring, it's also about giving credit - add this image to your page and give credit to the talented photographer who captured it.:
adrenaline aggression aggressive anxiety anxious behavior biochemical biochemistry biological biology body brain character cognitive compulsive concentration depressed depression disorder disorders dopamine drive drug drugs emotion emotional emotions endorphin endorphins feeling feelings flee flight function functions gaba glutamate happiness happy health hormone hormones human leaning learn medical medicine memory metabolism molecule molecules mood moods moody motivation negative neurotransmitter neurotransmitters noradrenaline obsession personality pharmaceutical pleasure psychology serotonin sex sleep stress