-Demosthenes- Posted January 13, 2005 Share Posted January 13, 2005 Cells die and are replaced, so over time owuld all the cells be replaced? Wouldn't the only original cells in an old person be brain cells, and all the others replaced? Link to comment Share on other sites More sharing options...
Giacomo525 Posted January 13, 2005 Share Posted January 13, 2005 yes? Link to comment Share on other sites More sharing options...
Primarygun Posted January 13, 2005 Share Posted January 13, 2005 Nerve cells cannot "reproduce" themselves Link to comment Share on other sites More sharing options...
-Demosthenes- Posted January 13, 2005 Author Share Posted January 13, 2005 So when your old you only have the same nerve cells? The heart and other organs have all been slowly replaced? Link to comment Share on other sites More sharing options...
Glider Posted January 14, 2005 Share Posted January 14, 2005 Pretty much. Things are replaced at different rates though. Your entire skeleton will be replaced about four times throughout your life, whereas the lining of your mouth is completely replaced about four times a day. The molecules making up nerve cells are replaced over time, so in a sense, nerve cells do regenerate, although technically, the cell remains the same cell, however, the material your teeth are made of is never replaced, so once they're gone, they're gone. Link to comment Share on other sites More sharing options...
-Demosthenes- Posted January 14, 2005 Author Share Posted January 14, 2005 Is there anything else that is never replaced?? Link to comment Share on other sites More sharing options...
Glider Posted January 15, 2005 Share Posted January 15, 2005 I'm not sure to be honest. I have a feeling that the material making up the lens of the eye is not replaced, although I may well be wrong there. Link to comment Share on other sites More sharing options...
PuelloDiablo Posted January 15, 2005 Share Posted January 15, 2005 Nerve cells cannot "reproduce" themselves Although recent exiting research show that they actually can!(although not in great quantities). Link to comment Share on other sites More sharing options...
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