if after seven years every cell in your body is completly new, how do tattoos remain?

Answer 1

Tattoos are not absorbed by the cells. The cells around a tattoo will change.I hope one day in my lifetime I will understand why people do that.

Answer 2

I am not sure who told you that every cell in your body is completely new in seven years, but it is entirely false. Neurons do not get replaced nor can you make new ones. Fat cells are for life and only shrink and expand you don't grow new ones. Brain, Heart, and Liver cells all have minimal regenerative properties, so you don't lose those either. Muscle cells also shrink or increase in size but don't become replaced. In fact there are very few cells which actually do regenerate including: RBCs, WBCs or immune cells, and skin cells.

As for the tattoo question: ink is deposited in the subcutaneous layer of the skin which does not shead and that is why the color stays. Only the stratum basale, stratum granulosum, stratum spinosum, stratum corneum, and stratum lucidim (in thick skinned areas) are shead and replaced.

Answer 3

http://www.madsci.org/posts/archives/jun2000/960301563.Gb.r.html

The ink is not in the epidermis, the layer of skin that we see and which
gets replaced constantly, but it intermingles with cells in the dermis and
shows through the epidermis. As you may know, the cells of the dermis are
very stable so the tattoo's ink will last (with a little bit of fading and
dispersion) for your whole life.

Answer 4

its not every cell in your body, its your dermis(outermost layer of skin)
and i heard it was 8 years, but thats beside the point.
tattoos are not surface-only! they go into tissue! that could be why people say they hurt so much.
i myself have never put myself through such an experiance.
i hope i helped.

Answer 5

the tattoos are an imprint under the skin it cannot be removed , unless with a lazer to kill the cells that are holding it