MadSci Network: Cell Biology

Subject: How often are all the cells in our bodies replaced?

Date: Tue May 16 19:05:37 2000
Posted by No name entered.
Grade level: nonaligned School: No school entered.
City: New York State/Province: NY Country: No country entered.
Area of science: Cell Biology
ID: 958518337.Cb

All the cells in our body have a certain lifespan, i.e., they only 
replicate a given number of times before they enter senescence and 
eventually die. Given that different kinds of cells have different 
lifespans, the sum of the whole human body lives considerably longer than 
any individual cell. So how long does it take for all of the cells in the 
body to have changed over at least one time? Is it a period of months, or 

Re: How often are all the cells in our bodies replaced?

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