Most cases of Parkinson's disease, however, are , meaning that the cause of cell death cannot be identified.
Dopamine is found in blood plasma at levels comparable to those of epinephrine, but in humans, over 95% of the dopamine in the plasma is in the form of dopamine , a conjugate produced by the enzyme acting on free dopamine.
do· pa· mine | \ ˈdō-pə-ˌmēn \ Definition of dopamine : a monoamine C8H11NO2 that is a decarboxylated form of dopa and that occurs especially as a neurotransmitter in the brain Examples of dopamine in a Sentence
dopamine. A monoamine NEUROTRANSMITTER and hormone with an adrenaline-like action. Dopamine is the principal neurotransmitter in the extrapyramidal system. It is formed in the brain from the amino acid tyrosine via dopa and the latter, in the form of levodopa is used to treat PARKINSON'S DISEASE. Dopamine is the precursor of noradrenaline.
Dopamine is a critical modulator of both learning and motivation. This presents a problem: how can target cells know whether increased dopamine is a signal to learn or to move? It is often presumed that motivation involves slow ('tonic') dopamine changes, while fast ('phasic') dopamine fluctuations convey reward prediction errors for learning.
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