Which white blood cell is involved in the immune response?

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Lymphocytes are the white blood cells that drive the immune response, especially the adaptive part. They include B cells, which produce antibodies to target specific invaders, and T cells, which help orchestrate the response and destroy infected cells. This makes them the central players in active immunity. Plasma is the fluid part of blood that carries antibodies but isn’t a cell. The thymus is an organ where some lymphocytes mature, not a white blood cell itself. The lymphatic system is the network that transports lymph and houses immune cells, but it’s not a cell type. So lymphocytes are the cells directly involved in the immune response.