Lecture : The white blood cells
2 Nov 2022
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0the white blood cells (wbcs) or leucocytes are so named since they are colourless in contrast to the red colour of red blood cells (rbcs). These are nucleated cells and play an important role in the defence mechanism of the body. The leucocytes of the peripheral blood are of two main varieties, distinguished by the presence or absence of granules. The wbcs with granules in their cytoplasm are called granulocytes. Depending upon the colour of granules, granulocytes are further divided into three types: They contain granules which take both acidic and basic stain. White blood cells which do not contain granules in their cytoplasm are called agranulocytes. Total leucocyte count total leucocyte count (tlc) varies with age. At birth, in full-term infant: 10,000 25,000/mm3 of blood. Infants up to 1 year of age: 6000 16,000/mm3 of blood. Children, 4 7 years of age: 5000 15,000/mm3 of blood. Children, 8 12 years of age: 4500 13,500/mm3 of blood.
