| Type | Leucocytes | Name of cell | Function |
| Granulocytes |  | ||
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| Agranulocytes |  | ||
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| Type | Leucocytes | Name of cell | Function |
| Granulocytes | | Neutrophil | Neutrophils are responsible for destroying pathogens by the process of phagocytosis. |
| Basophil | Basophils are present in infected and allergic conditions only. They secrete heparin, histamine and serotonin. | |
| Eosinophil | Eosinophils destroy antigen antibody complex by phagocytosis. Their number increases in allergic condition and they show antihistaminic property. They are also responsible for detoxification as they produce antitoxins. | |
| Agranulocytes | | Lymphocyte | B-lymphocytes are responsible for antibody production/humoral immunity. It is highly specific. T-lymphocytes are responsible for cellmediated immunity |
| Monocyte | Monocytes are mainly phagocytic and destroy the bacteria and dead or damaged tissue by phagocytosis. |
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