• The skin is the major organ of the integumentary system, which also includes the nails and hair.
  • The skin has 20 blood vessels, 650 sweat glands, and more than a thousand nerve endings.
  • It also has an incredible 60,000 pigment-producing cells.
  • All of these structures are packed into a stack of cells that is just 2 mm thick.
  • Although the skin is thin, it consists of two distinct layers, called the epidermis and the dermis.
  • These layers are shown in Figure below.
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