Blood accounts for about 8% of a human's body weight. new
Each day 400 gallons of recycled blood are pumped through the kidneys.
A woman has approximately 4.5 litres of blood in her body, while men have 5.6 litres.
Blood is such a good stain that Native Americans used it for paint.
By donating just one pint of blood, four lives can be saved.
In the early nineteenth century some advertisements claimed that riding the carousel was good for the circulation of blood.
Seven percent of a humans body wieght is made up of blood.
There are approximately 100,000 miles of blood vessels in the human body.
Two million red blood cells die every second.