What is the cellular composition of human blood?

One milliliter of healthy human blood consists of cell types in approximately the following numbers:

  • Leucocytes (function: immune response) 4–7 x 106 cells
  • Thrombocytes (function: wound closing) 3–4 x 108 cells 
  • Erythrocytes (function O2 and CO2 transport) 5 x 109 cells

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