Dopamine is a messenger substance that occurs in the body's nervous system and in the medulla of the adrenal gland. It docks to the adrenoceptors as well as to the dopamine receptors and transmits signals/information (neurotransmitter). Dopamine is a precursor of norepinephrine but also functions as an independent neurotransmitter. In our body, dopamine influences emotions, among other things, and therefore, like serotonin, it is often referred to as the "happiness hormone". Unlike serotonin, dopamine causes a longer-term increase in motivation and drive. Other tasks include increasing the ability to perceive, the ability to concentrate, and coordinating the management of acute stress with the other messengers serotonin, norepinephrine and epinephrine.