Answers. Best Answer: take the two laces, cross them, put one lace under the cross, pull. take laces again make laces into loop (make an O shape) cross loops put 1 loop under cross, pull, being careful to pull on sides connected to 1st knot, so as not to undo loops. you're done. Source(s):
In the United Sates, sickle cell anemia affects tens of thousands of blacks, and variations of it are seen in whites of Mediterranean, Middle-Eastern and East Indian descent. Hemoglobin is the oxygen-carrying protein of red blood cells. In sickle cell anemia, abnormal blood cells turn rigid, assume a sickle shape and block vessels. The painful episodes associated with the disease are fewer among patients who have a naturally higher level of fetal hemoglobin, which normally diminishes as people age.
Aplastic anemia is a rare disease in which the bone marrow and the hematopoietic stem cells that reside there are damaged. This causes a deficiency of all three blood cell types (pancytopenia): red blood cells (anemia), white blood cells (leukopenia), and platelets (thrombocytopenia). Aplastic refers to inability of the stem cells to generate mature blood cells. It is most prevalent in people in their teens and twenties, but is also common among the elderly. It can be caused by exposure to chemicals, drugs, radiation, immune disease, and heredity. However, in about half the cases, the cause is unknown. The definitive diagnosis is by bone marrow biopsy; normal bone marrow has 30â70% blood stem cells, but in aplastic anemia, these cells are mostly gone and replaced by fat.