More than a wrapper
What Does Your Skin Do?
Skin is a barrier, a thermostat, a sense organ and a self-repairing surface.
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Step 1 of 5
It is your largest organ.
Around two square metres and several kilograms. It is a working organ, not simply a covering.
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Step 2 of 5
The barrier is made of dead cells.
The outer layer is flattened dead cells packed with a waterproof protein. Being dead is the point — it can be worn away without harm.
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Step 3 of 5
It is replaced continuously.
You shed millions of cells a day and grow a completely new outer layer roughly every month. Most household dust is old skin.
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Step 4 of 5
It controls your temperature.
Blood vessels widen to dump heat and narrow to keep it in. Sweat glands add evaporative cooling when that is not enough.
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Step 5 of 5
It repairs itself.
A cut triggers clotting, then cleanup, then new tissue. Deep damage leaves a scar — repaired with strong but less organised tissue.
Skin colour comes from melanin, which absorbs ultraviolet and protects the dividing cells beneath from damage.
The short version
Skin is a self-replacing barrier that also controls temperature, senses touch and repairs its own damage.
Try it yourself
Pinch the back of your hand and let go. How fast it springs back reflects hydration and the elastic fibres inside.
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