In Red Blood Cells is hemoglobin, which binds to oxygen that is inhaled; this oxygen is then transported throughout the body by those blood cells. At the same time, carbon dioxide is picked up and returned to the lungs for removal from the body via exhalation. For optimal health, the body needs enough RBCs to have adequate oxygen-carbon dioxide exchange; therefore, the blood needs enough iron to be available to make enough Red Blood Cells.
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