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Blood contains three distinct cell types that can be differentiated histologically:

  • erythrocytes (red blood cells)
  • leukocytes (white blood cells)
  • thrombocytes (blood platelets)

The erythrocytes are the most numerous cell type, with about 4-5 million cells per microliter. They take up about 50% of the blood volume (hematocrit). The second most numerous cell type are the thrombocytes (about 150,000 - 300,000 cells per microliter). The number of leukocytes is only about 4,000 - 9,000 cells per milliliter blood.

Erythrocytes and thrombocytes don't have a nucleus, so they are not 100% "true" cells.

Author: Rosmarie Voegtli 


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 - Uploaded at 10.03.2011
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