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We are red blood cells. Our job is to transport oxygen and carbon dioxide using hemoglobin... Essentially, without us you die.
Polycythemia is a red blood cell abnormality where there is a drastic increase in RBC numbers. If there are too many of us than you die.
Anemia is the decrease in ability of blood to transport oxygen. This can be due to 3 reasons: (1) Decreased number of RBCs, (2) Deficient hemoglobin, or (3) Defective hemoglobin. Basically you can die if there are too many of us or not enough.
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