Mature blood cells have a short life span, and consequently the population must be continuously replaced with the progeny of stem cells, produced in the hematopoietic organs.
In the adult, red blood cells, granulocytes, monocytes and platelets are formed both in the red bone marrow, lymphocytes are formed both in the marrow and in the lymphatic tissues.
Figure22. Stages of erythrocytic and granular leukocytic differentiation (left) and dynamics of hemopoiesis in embryonic and fetal life (right)
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