Interesting Human Biology Facts

1. The purpose of eyebrows is to keep sweat from running into the eyes
2. Hair is the second fastest growing tissue on the body. Bone marrow is the first.
3. Hair is made out of the same substance as fingernails
4. Around 20% of the oxygen you breathe goes to your brain
5. You cannot properly tickle yourself as your brain knows that you are touching yourself and will not react in the same way as if something foreign were touching you
6. An adult human body requires around 90 pounds of oxygen per day
7. The heart produces enough pressure that it can squirt blood at a distance of over 35 feet
8. The human heart beats an average of 35,000,000 times per year – thus, the average human heart beats around 100,000 times per day
9. The volume of tears on the surface of our eyes is Seven micro liters (seven one thousands of a milliliter) when resting.
10. Most common solid tissue to be transplanted in the world is the cornea.