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Hematology

Hematology (haematologia; Greek haimatos, haima – blood + Greek logos – science, the doctrine) – the section of internal diseases which is engaged in studying of clinical manifestations, a pathogeny and etiology of diseases of system of blood, and developing ways of their prevention, treatment and diagnosis.

 
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The weight of a human brain makes about 2% of all body weight, however it consumes about 20% of the oxygen coming to blood. This fact does a human brain extremely susceptible to the damages caused by shortage of oxygen.