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.
Causes of anemia. Different types of anemia and their causes include: Iron deficiency anemia. This is the most common type of anemia worldwide. Iron deficiency anemia is caused by a shortage of iron in your body. Your bone marrow needs iron to make hemoglobin. Without adequate iron, your body can't produce enough hemoglobin for red blood cells. Without iron supplementation, this type of anemia occurs in many pregnant women. It is also caused by blood loss, such as from heavy menstrual bleeding, an ulcer, cancer and regular use of some over-the-counter pain relievers, especially aspirin. Vitamin deficiency anemia. In addition to iron, your body needs folate and vitamin B-12 to produce enough healthy red blood cells. A diet lacking in these and other key nutrients can cause decreased red blood cell production. Additionally, some people may consume enough B-12, but their bodies aren't able to process the vitamin. This can lead to vitamin deficiency anemia, also known as pernicious anemia. Anemia of chronic disease.