T lymphocytes

Definition

T lymphocytes are a type of white blood cell that play a central role in cell-mediated immunity, part of the adaptive immune system. They originate from stem cells in the bone marrow but mature in the thymus, which is how they get their "T" designation.

Related terms

Immune System: The complex network of cells, tissues, and organs that work together to defend the body against attacks by foreign invaders.

Antigens: Substances that can induce an immune response when detected by the body, often found on the surface of pathogens like bacteria and viruses.

Thymus: A small organ where T lymphocytes mature before they become active in the immune system