Skin and hair
Even at its thickest point, the skin is only millimetres thick. Even so, at almost one-seventh of the body's weight, the skin is the body's biggest organ. This surprisingly great weight shows just how important the skin is. It plays a role in metabolism and even in the body's balance. Hair and skin provide a stable and flexible covering for the body, protection against injury and evaporation, cold and heat, ultraviolet light and germs. And the skin is a sensor for touch and pain.



