The Census Bureau can also provide statisics and demographics cor the years 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 and 2009 on their website.
dopamine. n. 1. (Biochemistry) a chemical found in the brain that acts as a neurotransmitter and is an intermediate compound in the synthesis of noradrenaline.oun. 1. dopamine-a monoamine neurotransmitter found in the brain and essential for the normal functioning of the central nervous system; as a drug (trade names Dopastat and Intropin) it is used to treat shock and hypotension.
The precursor for dopamine is the amino acid tyrosine. This essential amino acid enters your body and bloodstream through your diet. An active transport mechanism takes up tyrosine from the bloodstream and concentrates it within the brain (particularly in the substantia nigra, midbrain, and hypothalamus).