What are immune cells?

Immune cells are the fundamental components of the immune system, capable of recognizing pathogens that threaten the body and taking action to defend against these invaders. Major types include B cells, T cells, natural killer cells, and macrophages. B cells are primarily responsible for producing antibodies; they can recognize antigens and secrete antibodies to combat foreign microorganisms or toxins. The main function of T cells is to activate or suppress immune responses and participate in eliminating pathogens. Known technically as "natural killer cells," these are a specialized type of T cell that identifies and attacks cells infected by viruses, bacteria, or tumor cells. Finally, macrophages help maintain the body's immune response by detecting foreign pathogens and clearing them away. These cells work together synergistically to resist viruses and bacteria, respond to external threats, and maintain the body's healthy state.