• Sex hormones
  The male testicles make testosterone. This hormone gives men their ...

• Body wastes
  Digestion, respiration and the chemical processes happening inside ...

• DID YOU KNOW?
  When you breathe out, you get rid of water and carbon dioxide. Plants ...

• Useful urine
  About 96% of urine is water. It also contains some waste salts and a ...

• Solid extras
  During digestion, solid wastes from your food pass through your large ...

• Kind kidneys
  Your two kidneys clean your blood and get rid of wastes. They contain ...

• Free flow
  Until you are about two years old, you pass urine as a reflex action. ...

• Baggy bladder
  Your bladder is like a muscular bag which stretches as it fills up ...

• Amazing But True
  About 150 litres (33 gallons) of fluid pass through your kidneys ...

• Stony kidneys
  If your kidneys do not get enough liquid passing through them, the ...