T helper cells orchestrate the immune response by activating other cells like B cells (for antibodies) and killer T cells (CD8 ) to fight pathogens, while killer T cells directly destroy infected or cancerous cells, acting as the immune system’s assassins; both are crucial for adaptive immunity, but helper T cells are the central commanders, activating the cytotoxic response T Helper Cells (CD4 ) Role: The “managers” or “commanders” of the immune system, activating other immune cells. Function:

B cells and T cells are white blood cells (lymphocytes) for adaptive immunity, but B cells make antibodies (humoral immunity) to neutralize pathogens, while T cells directly kill infected/cancerous cells or help coordinate the immune response (cell-mediated immunity). Both originate in bone marrow, but B cells mature there, whereas T cells travel to the thymus to mature. B Cells (B Lymphocytes) Primary Role: Produce antibodies (proteins) that tag pathogens (bacteria, viruses) for destruction or