HENNING DALHOFF / SCIENCE PHOTO LIBRARY HENNING DALHOFF / SCIENCE PHOTO LIBRARY
Skin anatomy. Computer illustration of a cross-section through the epidermis (light pink) and dermis (dark pink) of human skin. Four hair shafts are shown in their follicles. Within the dermis are blood vessels (blue and red), nerves (green) and sweat glands (beige). Skin is the first line of defence against infection and also plays an important role in maintaining a constant body temperature.
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