| Two million red blood cells die every second. |
| There are approximately 100,000 miles of blood vessels in the human body. |
| Seven percent of a humans body weight is made up of blood. |
| In the early nineteenth century some advertisements claimed that riding the carousel was good for the circulation of blood. |
| Each day 400 gallons of recycled blood are pumped through the kidneys. |
| By donating just one pint of blood, four lives can be saved. |
| Blood is such a good stain that Native Americans used it for paint. |
| The kidneys filter over 400 gallons of blood each day. |
| The average life span of a single red blood cell is 120 days. |
| Blood accounts for about 8% of a human's body weight. |
| A woman has approximately 4.5 liters of blood in her body, while men have 5.6 liters. |
| Your blood takes a very long trip through your body. If you could stretch out all of a human's blood vessels, they would be about 60,000 miles long. That's enough to go around the world twice. |
| Half your body’s red blood cells are replaced every seven days. |
| If all the blood vessels in your body were laid end to end, they would reach about 60,000 miles. |
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