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Blood Cell Production Bone Marrow • Soft, fatty, vascular tissue that fills most bone cavities • It is the place where new blood cells are produced. • There are two types of bone marrow: red marrow and yellow marrow. Red Bone Marrow • Red color • Consists mainly of hematopoietic tissue -Blood making • Found in flat bones (pelvis, sternum, cranium, ribs, scapula), vertebrae and spongy epiphyses of long bones. • Produces red blood cells, white blood cells and platelets • • • • • Yellow Bone Marrow Yellow color Yellow marrow is found in the medullary cavity(diaphysis of long bones) Mainly fat cells During aging red marrow is replaced by yellow In cases of severe blood loss the body can convert the yellow marrow back to red Bone Marrow Transplants Common Diseases: • Leukemia-produces immature blood cells • Breast Cancer • Ovarian Cancer • Aplastic Anemia-produces low blood cell count • Hodgkin’s Disease –found in lymphnodes, spleen, liver & bone marrow • Non-Hodgkin’s Disease (mostly infects children) • Brain Tumors • Immune Deficiency Diseases