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Plasma-- 55% of total blood volume
    91% water
    7% blood proteins (fibrinogen, albumin, globulin)
    2% nutrients (amino acids, sugars, lipids)
          hormones (erythropoietin, insulin, etc.)
          electrolytes (sodium, potassium, calcium,etc.)
Cellular components-- 45% of total blood volume
    white blood cells (4000-11 000 per mm^3 of blood)
    platelets (150 000-300 000 per mm^3 of blood)
    red blood cells (4-6 million per mm^3 of blood)
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