As the popular classical neurotransmitter, why do we need dopamine and how can it help us in our promotion of health and treatment of disorders? Dopamine does not simply reside in our brains but its presence within the human body extends to our immune system and even the renal organ. Read about dopamine's multi-faceted functions and involvement in regulating our blood pressure through our kidneys, enhancement of our sense of reward and positivity, and how it has a significant role to play in the future pharmacological treatment of depression and schizophrenia.