Definition of Lymphocyte

Reviewed on 3/29/2021

Lymphocytes: A small white blood cell (leukocyte) that plays a large role in defending the body against disease.

Lymphocytes are responsible for immune responses. There are two main types of lymphocytes: B cells and T cells. The B cells make antibodies that attack bacteria and toxins while the T cells attack body cells themselves when they have been taken over by viruses or have become cancerous. Lymphocytes secrete products (lymphokines) that modulate the functional activities of many other types of cells and are often present at sites of chronic inflammation.

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