This image shows an apoptotic (dying) red blood cell. Because the red blood cells cannot repair themselves, (as they have no nucleus or other important organelles), their life span is comparatively short, some 120 to 130 days. At any given moment, red blood cells in your body are dying at a rate of about 2 million per second, and to replace them, new ones are formed in the bone marrow at about the same rate.
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