Bone marrow produces three distinct types of blood cells: red, white, and platelets. Anemia occurs when the quantity of red blood cells in the blood is low. Leukopenia is diagnosed when the white blood cell count is low. Thrombocytopenia is too few platelets. Pancytopenia is when all three of these conditions happen at the same time.
Red blood cells contain a special protein, hemoglobin, that carries oxygen from the lungs to all of the other tissues in the body, then returns carbon dioxide to the lungs. Not having enough red blood cells affects many systems throughout the body.
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