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Color Atlas of Hematology - Practical Microscopic and Clinical ...

Color Atlas of Hematology - Practical Microscopic and Clinical ...

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2Physiology <strong>and</strong> Pathophysiology <strong>of</strong> Blood CellsIntroduction to the Physiology <strong>and</strong>Pathophysiology <strong>of</strong> the HematopoieticSystemThe reason why quantitative<strong>and</strong> qualitative diagnosisbased on the cellularcomponents <strong>of</strong> the blood isso important is that bloodcells are easily accessibleindicators <strong>of</strong> disturbancesin their organs <strong>of</strong> origin ordegradation—which aremuch less easily accessible.Thus, disturbances in theerythrocyte, granulocyte,<strong>and</strong> thrombocyte seriesallow important conclusionsto be drawn aboutbone marrow function, justas disturbances <strong>of</strong> the lymphaticcells indicate reactionsor disease states <strong>of</strong>the specialized lymphopoieticorgans (basically,the lymph nodes, spleen,<strong>and</strong> the diffuse lymphaticintestinal organ).NK cellsPluripotentlymphaticstem cellsT-lymphopoiesisT-lymphoblastsPluripotent hemato-B-lymphopoiesisB-lymphoblastsCell SystemsAll blood cells derive from acommon stem cell. Underthe influences <strong>of</strong> local <strong>and</strong>humoral factors, stem cellsdifferentiate into differentNK cellsT-lymphocytesB-lymphocytesFig. 1 Model <strong>of</strong> cell lineages in hematopoiesisPlasma cells

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