ASINSBALSS - jautā, un tev taps atbildēts :D

Lūk, atbilde uz jautājumu, kas mani nodarbināja gadiem (bet nekad neienāca prātā iegūglēt). Tātad:

If cells reproduce every 7 years, why do tattoos remain permanent?

The tattoo remains permanent because, done correctly, the tattoo artist is going to introduce pigment particles underneath the epidermis into the skin strata between the epidermal and dermal layers. The dermal layer contains numerous blood vessels, nerves, hair follicles and lymphatic vessels. The tattoo pigments lay trapped in the dermis. Trapped? Yes, trapped. Tattoo pigments are foreign objects. If it could your body would eject those pigment particles in a heartbeat. In fact, within moments of a tattoo needle penetrating your skin your body is readying its defenses. A tattoo is a wound and the presence of foreign material immediately rallies your lymphocytes – or killer cells - to the scene of the injury. The lymphocytes will remove any pigment particle that is small enough, but your body has to adopt a different strategy for any pigment boulders that the lymphocyte bulldozers can’t move. When faced with particles too big to remove, macrophages (literally Greek for “big eaters”), which are another form of white blood cells, will encircle the particle and devour it. If the pigment particle is inorganic and non-toxic, the macrophage will begin a process that will result in the formation of scar tissue around the particle, walling it off and anchoring it in place. And there it will remain, indelible and permanent. However, if your body’s defenses determine that the particle is organic or toxic it will result in either an infection or an attempt to reject the particle from your body to prevent further damage.


/vairāk te