Two immunologically active blood cells are B lymphocytes and T lymphocytes. B lymphocytes (B cells) are manufactured in the bone marrow. T lymphocytes (T cells) are derived from the:

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The thymus is the primary site in the body where T lymphocytes mature and differentiate. Mature T cells leave the thymus and migrate to organs such as the spleen, the lymph nodes, and other organs where they can be exposed to foreign antigens and stimulate or modulate cell-mediated immune responses. The testes are obviously not the source of T cells. If they were, T cells would only be present in men. The thyroid gland is an endocrine organ that produces and releases thyroid hormone. The tonsils are lymph nodes located in the oropharynx. They are exposed to antigens that enter the body through the mouth or the nose.

Two Immunologically Active Blood Cells Are B Lymphocytes and T