Anemia is defined as having an abnormally low number of red blood cells. Red blood cells are the only cells in the body that contain hemoglobin. Hemoglobin is a protein that is responsible for transporting oxygen throughout the bloodstream. The production of red blood cells takes place in the bone marrow, which is followed by their release into the bloodstream. The average lifespan for one of these is between 110 and 120 days. The spleen and the liver are responsible for filtering out of the blood any older red blood cells. When the bone marrow fails to produce enough new red blood cells to replace the ones that have been lost due to death, this can lead to anemia. Alternately, it may occur if the red blood cells pass away or are destroyed at a faster rate than is typical.
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