I have seen it said that EVERY cell in the body renews itself every x number of years, most often it seems to be 5 or 7.
I just cant buy this thinking about issues such as scars, fractures that while they heal remain in the bones, long term diseases, conditions such as emphasima (sp?) where renewal of the cells in the lungs would theoretically bring about a cure, paralysis, finger prints, eye colour, long term memory, aging etc.
What I am seeking is credible references which prove that TOTAL renewal is a falsehood. Sure there is a great deal of change in the body but according to my preliminary googling I have already seen mentioned that the brain, spinal and nerve cells do not regenerate.
Despite constant curiosity I am not really scientifically minded so I would appreciate any guidance in referencing a rebuttal to the assertion that not one part of our body is permanent.