• Cuts …
  If your skin is damaged, it quickly repairs itself. First, your blood ...

• DID YOU KNOW?
  Your skin is covered in a film of oil, called sebum. It is made by ...

• Skin-deep colour
  The colour of your skin depends on how much of the brown-black ...

• In a cold sweat
  Sweat is a salty liquid made in curly glands deep in the dermis. It ...

• and bruises
  A hard knock may break some of the blood vessels under your skin. The ...

• Under your skin
  Deep under your skin, beneath the dermis, is a layer of fat. It acts ...

• Circulatory system
  Blood flows from your heart along strong tubes, called arteries ...

• Amazing But True
  There are about 96,000km (59,520 miles) of blood vessels (arteries, ...

• What is in blood?
  The main ingredients in blood are: 1. A watery fluid, called plasma. ...

• Amazing artery
  The aorta is the largest artery in the body. It is about 2.5cm (1in) ...