Blood consists of plasma containing cells and cell fragments. Three groups of blood cells can be identified, namely (a) red blood cells or erythrocytes, (b) white blood cells or leucocytes and (c) platelets or thrombocytes. The white blood cells can be separated into neutrophilic-, eosinophilic- and basophilic granulocytes, lymphocytes and monocytes. The life time of these cells is limited. For example, in man life time for normal erythrocytes is about 120 days and for granulocytes a few days. The daily production of these cells required to maintain normal numbers in blood can be calculated from their life span, their concentration in the blood and the total blood volume. Thus, an adult human male produces approximately 2 x 10¹¹ erythrocytes and 1 x 10¹⁰ granulocytes every day. These amounts are necessary for normal maintenance but the production of blood cells can be increased after stress, for example, infection or blood loss

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Erasmus University Rotterdam
O. Vos
hdl.handle.net/1765/50989
Erasmus MC: University Medical Center Rotterdam

Nikkels, P. (1989, March 22). The hemopoietic microenvironment : effects of chemotherapy and irradiation. Retrieved from http://hdl.handle.net/1765/50989