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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.

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1. What Do Red Blood Cells Do?

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.

Red Blood Cells BlackJack3D / Getty Images
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This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.