20 Facts About Human Blood We Didn’t Know About


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Does menstrual blood really attract bears? Why does blood look blue in your veins? And why were the first blood transfusions performed with animals? Weird World has collected interesting scientific facts about our blood that you probably don’t know.

    • It would take 1,120,000 mosquitoes to drain all the blood from an adult human.
    • Horseshoe crabs bleed blue. Certain leeches bleed green. And some species of marine worm – including penis worms – bleed violet.

      Source : Elite Readers

    • Blood types aren’t unique to humans. Dogs have more than a dozen, for example.
    • To make blood circulate, the heart creates such pressure that it can release a 30-ft-high stream of blood.
    • There is gold in your blood. Human blood contains metals atoms including lead, chromium, iron, manganese, copper, and zinc. You may also be surprised to learn that blood contains small amounts of gold.
    • The claim that bears are attracted to the smell of menstruating women can be traced to an attack on two female hikers in 1967 by grizzly bears but its all fad.
    • A human being can live without a pulse. In 2012, doctors installed a device in 55-year-old Craig Lewis’ body that allows blood to circulate throughout his body without a pulse.
    • The amount of blood that passes through the body in circulation in 25 days is approximately equal to a medium-sized swimming pool.
    • A person may lose 40% of their blood and still stay alive. Of course, a timely blood transfusion is needed.
    • Prior to the discovery of the circulatory system, blood was thought to “burn up” in the heart.
    • Blood types wouldn’t be formally identified until 1901, when Austrian researcher Karl Landsteiner observed that blood from different people would agglutinate, or clump, when mixed together.

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