what do you mean by lymphocytes

Definition:Lymphocytes are small white blood cells that play an role in the bodys immune response (that is, in the bodys fight against germs and diseases).

There are two main types of lymphocytes, known as B cells and T cells (also known as B lymphocytes and T lymphocytes). The B cells produce antibodies that attack foreign molecules (germs and the toxins they produce). The T cells are more complicated, but they can attack the bodys own cells when they are diseased (for example, when the cells have been invaded by cancer or viruses).