Dopamine (DA) is a compound of the family of catecholamines and phenethyl that plays a vital role in the body and brain. Dopamine is synthesized from its precursors in the brain and kidneys، dopamine is also synthesized in most plants and animals. Dopamine plays a role in the brain as a neurotransmitter and a hormonal role in the blood، dopamine is stored mainly in the vesicles (microclimate)of the dopaminergic neurons and also in the glands in the neuron.there are several dopamine pathways in the brain called dopaminergic pathways، dopamine plays the most important role in generating pleasure and reward.increased dopamine in certain areas of the brain known as the reward center creates a sense of euphoria (reward), which is why dopaminergic drugs are used in large quantities. Dopamine also plays a role in the control of the motor system, so that with the loss of dopaminergic neurons, the cause of Parkinson's disease appears. Other functions of dopamine in the brain are to control and regulate the secretion of hormones. Dopamine reduces the secretion of prolactin by stimulating the two-dopamine receptor (22), thereby also affecting milk production.

on the outside of the brain and in the body, dopamine, the role of hormonal there. dopamine in the blood of the liberation of norepinephrine helps prevent and causes a narrowing of the blood vessels is recommended. in the kidney excretion of sodium and urine volume increases. It decreases the secretion of insulin from the pancreas and also reduces the mobility of the digestive tract.