Essential facts about human body

Do you know that...

• The fastest growing tissue in human body is hair.
• A brain represents about 2% of your total weight,  it is  roughly 140mm wide, 167mm long and 93mm high.
• From all the oxygen that a human breaths, twenty percent goes to the heart.
• Humans are born with 300 bones in their body, however when a person reaches adulthood they have only 206 bones.this happens because many of them join together to make a single bone.
• There are 54 bones in your hands including the wristes.
• The only bone fully grown at birth is located in the ear.
• The smallest bone in the human body is the stapes bone which is located in the ear.
• Your brain is about 75-80%of water.
• Enamel is the hardest substance in the human body and it is located in the teeth.
• Although the outside of a born are hard,  they are generally light and soft inside. They are about 75% of water.
• Adult human bones account for 14% of the body total weight.
• The reason why hair turn gray is because as we age the pigment cells in the hair follicle starts to die, which is responsible for producing "melanin" which gives the hair color.
• The fastest growing tissue i the human body is hair.
• Finger nail grow nearly 4times faster than toes nails.
• Your bone is stronger than concrete..
• Eyebrow hair last between 3-5months before it sheds.
• A life span of an eyelash is approximately 150days.
• Hair and finger nails are made from the same substance, keratin.
• Two billion red blood cells die every second.
• There aproximately 100, 000 miles of blood vessels in the human body.
• Each day 400 gallons of recycled blood are pumped through the kidneys.
• By donating just one pint of blood , four lives can be saved.
• A woman has aproximately 4.5 litres of blood in her body while men havve 5.6 litres .
• Your blood takes a very long trip through your body. If you could strech out all of human blood vessels, they would be about 60.00 miles long, thats enough to go around the world twice.