B cells and T cells are lymphocytes (white blood cells). Each has a different way of fighting infection. B and T cells start life in the bone marrow. B cells are homebodies and stay in the marrow to mature. T cells, on the other hand, leave the bone marrow early and move to the thymus, an important organ of the lymphatic system located in the upper chest. The young T cells mature in the thymus (hence the "T" in T cell). After they reach maturity, B and T cells travel via the bloodstream to the peripheral lymphoid tissues -- lymph nodes, spleen, tonsils, adenoids, appendix, and so on -- where some remain. The others circulate in the blood, migrating from one lymphoid organ to another.
Peter Cohen, MD
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What are B cells and T cells?
Anthony Komaroff, MD, Internal Medicine, answered
What is blood serum?
Healthwise answeredBlood serum is the sticky, watery liquid left after the solid parts of the blood (the red blood cells, white blood cells and platelets) have clumped (coagulated).
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What is meant by the Rh (rhesus factor)?
American Red Cross answeredMost people have an inherited antigen on their red blood cells known as Rh, or D antigen. When the D antigen is present, a person’s blood is designated Rh positive. When D antigen is missing, the blood group is designated Rh negative. In general, Rh negative blood is given to Rh negative patients, and Rh positive blood or Rh negative blood may be given to Rh positive patients.
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