7. After long physical exercises sportman's hematocrit made 50%. Such a blood parameter is first of all the result of: A. Water loss with the sweat B. Increase the quantity of blood cells C. Increase the volume of circulated blood D. Decrease the diuresis E. Increase the ptotein's content in the blood

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Hematology

Hematology is the branch of biology. Hematology is the medical field that deals with the treatment of blood disorders and cancers, such as hemophilia, leukemia, lymphoma, and sickle-cell anemia. Hematologists and hematopathologists are medical professionals who specialize in illnesses of the blood and its components.