Amazing Facts About The Human Body ( 6~10 )

6. The largest organ in the body is the skin. In an adult man it covers about 1.9m2 (20sq ft). The skin constantly flakes away - in a lifetime each person sheds around 18kg (40 lb) of skin.
7. When you sleep, you grow by about 8mm (0.3in). The next day you shrink back to your former height. The reason is that your cartilage discs are squeezed like sponges by the force of gravity when you stand or sit.
8. The average person in the west eats 50 tonnes of food and drinks 50,000 litres (11,000 gallons) of liquid during his life.
9. Each kidney contains 1 million individual filters. They filter an average of around 1.3 litres (2.2 pints) of blood per minute and expel up to 1.4 litres (2.5 pints) a day of urine.
10. The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.