limfocitákkal

Lymphocytes are a type of white blood cell that play a crucial role in the immune system. They are one of the five types of white blood cells and are essential for adaptive immunity. Lymphocytes are produced in the bone marrow and mature in various lymphoid tissues, including the thymus, spleen, and lymph nodes. There are three main types of lymphocytes: B cells, T cells, and Natural Killer (NK) cells.

B cells are responsible for humoral immunity. When they encounter a foreign substance, or antigen, they differentiate into plasma cells, which produce antibodies. These antibodies can neutralize pathogens or mark them for destruction by other immune cells. Some B cells also become memory cells, which allow for a faster and stronger response upon subsequent exposure to the same antigen.

T cells are involved in cell-mediated immunity. Helper T cells assist in activating other immune cells, including B cells and cytotoxic T cells. Cytotoxic T cells directly kill infected cells or cancerous cells. Like B cells, T cells can also form memory cells.

Natural Killer (NK) cells are part of the innate immune system. They can recognize and kill cells that display signs of stress or infection without prior sensitization. NK cells are particularly important in eliminating virus-infected cells and tumor cells.

Lymphocytes are a vital component of the body's defense against infections and diseases. Their coordinated actions ensure a comprehensive immune response.