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In which human body system do the white blood cells function?

A Lymphatic

White blood cells are known as lymphocytes, a clue to the fact that they function in the lymphatic system to produce antibodies and destroy virally affected or foreign cells. While they are also found within the circulatory system, that is, in the bloodstream, they do not function there but are only in transit from the bone marrow to the lymphatic system. The endocrine system includes the pancreas, male testes, female ovaries and uterus, and all of the body’s glands, which secrete hormones regulating bodily function, metabolism, and growth.