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The
skin, the external living tissue covering our body,
is the organism's most extensive organ, with a surface
area representing roughly two square metres for
an adult.
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 n
different areas of the body, it varies in
thickness and colour, and also in the presence
of body hair and glands. It is made up of
three successive layers: the
epidermis, the
dermis, and, deep down the
hypodermis.
Acting
as an interface between the organism and the
outside world, the skin's first job is to
protect the body.
To
that end, the two billion cells which make
up the skin are in constant renewal, three
hundred million of them being replaced on
a daily basis. Cells are the smallest units
of a living substance and their nuclei hold
DNA, carrier of our genetic hereditary material.
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