and explain with good reason and example...........
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No
Many cells remain with us throughout our lives (or at least our adult lives). In particular, nerve cells are not replaced although damaged axons may re-grow.
Your question seems to be the result of confusing between cells being replaced and atoms in the body being replaced. Even though some of our cells may stay with us all our lives, the atoms that make up those cells are constantly being replaced so that it has been estimated that every 15-20 years or so every atom in the human body has been replaced.
Many cells remain with us throughout our lives (or at least our adult lives). In particular, nerve cells are not replaced although damaged axons may re-grow.
Your question seems to be the result of confusing between cells being replaced and atoms in the body being replaced. Even though some of our cells may stay with us all our lives, the atoms that make up those cells are constantly being replaced so that it has been estimated that every 15-20 years or so every atom in the human body has been replaced.
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Some of the cells in the body are replaced as frequently as every six weeks, depending upon your age. When you start getting wrinkles you will know that your cell reproduction has slowed significantly.
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Brain cells are not replaced. Once they're gone, they're gone.