I read somewhere that human cells die in body and get replaced by new one....Is it true, if so then,
How much time (years) it takes tor enew all human cells?
2006-08-19 04:35:55 · 4 answers · asked by guess 1 in Science & Mathematics ➔ Biology
It varies. Epithelial (skin) cells are replaced continuously, red blood cells every 90 days, white blood cells may live for years, certain nerve cells live 50-70 years.
2006-08-19 05:33:41 · answer #1 · answered by davidosterberg1 6 · 0⤊ 0⤋
Not all the cells in the human body can be replaced.
7 years is how long it takes bones to completely turnover. That actually refers to the inorganic mineralized substrate. I don't know how long the bone cells live--I would guess for your entire lifetime.
Red blood cells are usually said to turnover in 120 days, not 90.
White blood cells--varies. Memory B-cells last for potentially a lifetime, although the fact that people sometimes need to be re-vaccinated suggests it can be shorter.
Platelets aren't really cells, but they turnover in about a week.
Cells in the skin and GI tract turnover continuously because those are areas that have to withstand constant abrasion and biochemical damage.
Nerves don't turnover normally. If injured, peripheral nerves can regenerate. CNS nerves (brain, spinal cord) generally don't regenerate, which is one of the reasons people are interested in embryonic stem cells (to try to replace dead/damaged CNS nerve cells).
2006-08-19 06:24:00 · answer #2 · answered by grimmyTea 6 · 0⤊ 0⤋
Every 7 yrs all cells regenerate and get replaced by "new cells"
2006-08-19 04:41:25 · answer #3 · answered by mochanut_9 3 · 0⤊ 2⤋
the time that it is going to take you to learn how to spell!!!!!!!!!!!!
2006-08-19 04:44:17 · answer #4 · answered by Anonymous · 0⤊ 0⤋