All about skin
About ten million.
113
Cooling down
When sweat dries on your
skin, it helps to cool you
down. Sweat comes from
coiled tubes under the
surface. It gets out
through tiny holes
called pores.
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Sweat
Sweat pore
Sweat gland
Soggy skin
When you soak in water for a long
time, the top layer of your skin gets
waterlogged and wrinkly.
If you uncurled a
sweat gland, it could
be over a metre
(3 ft) long.
Skin colour
The colour of your skin is affected by a
substance called melanin. The more melanin
you have, the darker you will be. When you
are outside in the sun, your body produces
extra melanin to protect your skin. This melanin
makes your skin darker and you get a suntan.
