It has to do with the bone marrow red cells are needed for cells and life. White is often increased when there is disease or infection in the body. White cells lymph will increase to fight infection. If there is increase without infection there is a disease sometimes Leukemia. Metabolism is the building up and breaking down of the cells. Anabolisms and c anabolism.
All those red and white blood cells are driving me crazy!!!! ... Most white blood cells are formed in the bone marrow (along with red blood cells), but some are formed in the lymph nodes and spleen.