human blood

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Leeches, they love your blood

Xavier Bage @franxav (14591) • India 7 Dec 15

If you have ever been to my native region, foothill plains near Darjeeling, India, you must have seen a particular kind of leeches found in damp grasses and bushes. They can smell human blood and rush to attack. If one of them...

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Is human blood really blue and only turns red when it is exposed to air?

galvernize @galvernize (23) 8 Jun 07

I just got told that blood is only red when it is outside of the body and it is blue when it is inside can this be true i'm baffled can anyone enlighten me? thank you

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