9.2.1 Types of Immune Cells and Their Roles
White blood cells (WBC) play a significant role in the immune system by protecting the body from infectious disease and foreign invaders. WBC are of three main types i.e., granulocytes, monocytes and lymphocytes.
(I) Granulocytes: Granulocytes have granular cytoplasm and nuclei with different shapes. It has three types.
(II) Monocytes: Monocytes are the largest type of white blood cells. Monocytes typically circulate in the blood for 1-3 days before migrating into tissues, where they become macrophages or dendritic cells.