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All wrapped up (Skin, nails, and hair)

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									Skin, nails,               and    hair

                                      All wrapped up
                                      Skin covers your whole body. It protects
                                      you from germs, water, and sunshine,
                                      and helps keep your body at the right
                                      temperature.
The skin on your
eyelids
is the thinnest                  Two layers
on your body.
                                 Your skin has two main layers.
                                 The top one – the one you can see –
                                          is called the epidermis.
                                                 Underneath is the
                                                   dermis, where there
                                                     are nerves and
                                                      blood vessels.


                                                                                         Waterproof seal
                                                               There are flat cells on
                                                              the surface of your        Skin stops water getting into your
                                                             skin. These are made        body when you have a shower or
                                                           from a tough material
                                                                                         go for a swim. It also stops fluids
Sk




                                                         called keratin. When the
                                                       cells die, they dry out and       escaping from inside you.
  in




        is                                           flake off.
           a                                                                                                            Magnified skin flakes
                   sor                           Skin cells lower down
                      t   of                     replace the dead ones
                                                 that flake off.
                             s
                            tre




                                                                                             House dust
                               tch




Heavy load                                                                                   Dust is mostly                               on
Skin is the                                                                                  made of dead
                                   y




heaviest single                                                                              skin. Dust mites
                                    overco




                                                                                                                                     n
                                                                                                                                  ski


part of your                                                                                 feed on this skin.
body. It can                                                                                 They live in
                                                                                                                                     st




weigh as much                                                                                beds, pillows,
                                                                                                                           The thicke
                                           at.




as a bag of                                                                                  and carpets.
shopping.
                                                                                             Dust mites aren’t
                                                                                             really this big! They’re
                                                                                             so small you can’t see
                                                                                             them.
68
                                 How many dead skin flakes fall off every day?
                                                                            All wrapped up
                                                                           Sweat




                                                                           Sweat pore




                                                                             Sweat gland




                                                   If you uncurled a
                                                   sweat gland, it could
                                                   be over a metre (3ft)
                                                   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.

                           oles of y
                is on the s
        y
   r bod
                                          ou




  u
yo
                                            r fe
                                               et.




                                                                  Cooling down
                                                          When sweat dries on your
                                                            skin, it helps to cool you
                                                        down. Sweat comes from
  Soggy skin                                            coiled tubes under the
  When you soak in water for a long                      surface. It gets out
  time, the top layer of your skin gets                through tiny holes
  waterlogged and wrinkly.                                 called pores.

                                      About ten million.                                   69

								
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