B lymphocyte
Noun: A type of white blood cell (lymphocyte) that originates in the bone marrow. It is a crucial component of the adaptive immune system responsible for humoral immunity. B lymphocytes function by recognizing specific, free-floating antigen molecules. Upon activation, they mature into plasma cells that produce and secrete large amounts of antibodies (immunoglobulins), which neutralize or mark antigens for destruction.
The term "B lymphocyte" is used in medical, biological, and immunological contexts to refer to this specific immune cell. It is often discussed in relation to its function, development, or role in disease and vaccination. * The B lymphocyte is essential for the body's defense against bacterial infections. * Vaccinations work by stimulating B lymphocytes to produce memory cells for long-term immunity. * A deficiency in B lymphocytes can lead to an increased susceptibility to infections.
- B cell receptor (BCR): The specific membrane-bound antibody on the surface of a B lymphocyte that allows it to bind to a particular antigen.
- B cell activation: The process by which a B lymphocyte is stimulated by an antigen (often with helper T cell assistance) to proliferate and differentiate.
- Memory B cell: A long-lived B lymphocyte that "remembers" a specific antigen, enabling a faster and stronger antibody response upon re-exposure.
- B cell: A common abbreviated synonym for B lymphocyte.
- Plasma cell: The terminally differentiated, antibody-secreting effector cell into which an activated B lymphocyte matures.
- Lymphocyte: The broader category of white blood cells that includes B lymphocytes and T lymphocytes.
- B cell
- T lymphocyte (T cell): A different type of lymphocyte that mediates cell-mediated immunity and assists B cells, rather than producing antibodies directly.
- Humoral immunity: The aspect of immunity mediated by macromolecules found in extracellular fluids, such as antibodies secreted by B lymphocytes.
- Antibody production: The primary function of activated B lymphocytes.
- Clonal selection: The theory explaining how a specific B lymphocyte is selected and activated by its matching antigen.
- a lymphocyte derived from bone marrow that provides humoral immunity; it recognizes free antigen molecules in solution and matures into plasma cells that secrete immunoglobulin (antibodies) that inactivate the antigens