Chapter 47/42 Anemias, Hemophilia, Leukemia, HIV Blood disorders: During Childhood, RBCs are formed in the marrow of the long bones; by adolescence, hematopoiesis takes place in the marrow of the ribs, sternum, vertebrae, pelvis, skull, and bone marrow. Lymphatic System: Drains regions of the body to lymph node where infections are destroyed. Antibody production is stimulated. Spleen is the largest lymphatic organ. One of the main purposes of the lymphatic system is to bring blood into contact with lymphocytes. Most common pathos condition is enlarged spleen. Blood consist of 2 portions: Plasma and formed elements: Erythrocytes (transport o2 and co2 to and from the lungs, Leukocytes (defense against infection), Thrombocytes (platelets). Anemias: Patho: Reduction in the amount of...