Lymphocytes - GCSE Biology Definition

Lymphocytes are a type of white blood cell that plays a vital role in the immune system. They help your body fight off pathogens, such as bacteria and viruses. There are two main types of lymphocytes: B cells and T cells. B cells produce antibodies, which are proteins that bind to pathogens to help destroy them. T cells have different roles, including killing infected body cells and supporting other immune cells. Lymphocytes circulate in the blood and can also be found in the lymph nodes and spleen. Together, they help the body to recognise and respond to pathogens that might cause disease.