In adults, the only site of red blood cell production, and the primary site of white blood cell formation,is the

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Red bone marrow is the primary site of both red blood cell and white blood cell formation in adults. The liver and spleen may produce blood cells in fetuses, but this function stops shortly after birth. The thymus is responsible for the development of T-lymphocytes, but not blood cell production. Yellow bone marrow contains adipose tissue and no longer produces blood cells.

In Adults, the Only Site of Red Blood Cell Production