I'm guessing my skin cells aren't undergoing
mitosis continuously, because I'll be 70 yrs old
this week, and my skin is getting old. Or maybe
mitosis just takes longer in my old skin cells.
But my skin cells are still undergoing mitosis
fast enough to keep an unbroken layer of skin over
Our skin is exposed to the outside world, where
it encounters air that dries it out, and getting
rubbed by our clothes, and injuries caused by
things outside our bodies. The cells inside our
bodies don't have to experience any of those
things. That's why our skin cells undergo mitosis
continually, to protect our bodies from these
things, and from harmful microbes.
Here's what the National Institute of Health
says about skin when it gets injured:
"...injured cells at the site of a wound send
'go' signals to the surrounding skin cells, which
respond by growing and dividing and eventually
sealing over the wound."
Click Here to return to the search form.