Cell Regeneration--or not

Is it really true that body organs are replaced regularly? Most cells in the body are replaced regularly so eventually a body organ, such as the heart, likely has every cell replaced over time. Some cells die due to age or wear and tear; some reach the end of their life cycle. There are many different estimates, but here are a few: Taste buds every 10-14 days New bones every 10 years New heart every 20 years Margaret Reese, PhD, estimates that only a few groups of cells in a few body parts last most of your lifetime. They include neurons in the cerebral cortex; muscle cells of the heart; and the inner lens cells of the eye. More tomorow.