Which is a lymphocyte?

Lymphocytes are a type of white blood cell that plays a crucial role in the body's immune system. They are produced in the bone marrow and mature in the lymph nodes and other lymphoid tissues. There are several types of lymphocytes, each with specific functions:

- B cells (B lymphocytes): B cells produce antibodies, which are proteins that recognize and bind to specific foreign substances (antigens). When a B cell binds to an antigen, it can multiply rapidly and differentiate into antibody-secreting plasma cells.

- T cells (T lymphocytes): T cells have several functions, including killing virus-infected cells and cancer cells, helping B cells produce antibodies, and regulating immune responses. There are different types of T cells, such as cytotoxic T cells, helper T cells, and regulatory T cells.

- Natural killer (NK) cells: NK cells are a type of cytotoxic lymphocyte that can directly kill virus-infected cells and cancer cells without prior sensitization.

- Other lymphocytes: In addition to B cells, T cells, and NK cells, there are other types of lymphocytes, such as dendritic cells, macrophages, and mast cells, which are involved in various aspects of the immune response.

Lymphocytes are essential for the body's defense against infections, recognition and elimination of abnormal cells, and immune surveillance. They play a central role in both innate and adaptive immune responses.