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"It is difficult to believe that until approximately year 1900 it was not known that neurons are the basic units of the brain (Santiago Ram? Equally surprising is the fact that the concept of chemical transmission in the brain was not known until around 1930 (Henry Hallett Dale) and (Otto Loewi).

Grey matter is found in clusters of neurons in the brain and spinal cord, and in cortical layers that line their surfaces.Most nerves serve both functions and are called mixed nerves.The PNS is divided into a) somatic and b) autonomic nervous system, and c) the enteric nervous system. The autonomic nervous system is further subdivided into the sympathetic and the parasympathetic nervous systems."Physical" is used to distinguish physical capital from human capital (a result of investment in the human agent)), circulating capital, and financial capital.[1][2] "Physical capital" is fixed capital, any kind of real physical asset that is not used up in the production of a product.Usually the value of land is not included in physical capital as it is not a reproducible product of human activity.

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