Fig. 7.14 Cells of the immune system

Fig. . Cells of the immune system XII Std Biology-Zoology Chapter- XII Std Biology-Zoology Chapter- Human Health and Diseases called cytokine which activates B cells. Killer cells move around the body and destroy cells which are damaged or infected (Fig. . ) . Apart from these cells neutrophils and monocytes destroy foreign cells by phagocytosis. Monocytes when they mature into large cells, they are called macrophages which perform phagocytosis on any foreign organism. Dendritic cells are called so because its covered with long, thin membrane extensions that resemble dendrites of nerve cells. These cells present the antigen to T-helper cells. Four types of dendritic cells are known. They are langerhans, interstitial cells, myeloid and lymphoid cells