Tag: blood

Blood Types & Compatibilities

National Blood Donor Month: Blood type compatibilities

Blood Types & Compatibilities
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January is National Blood Donor Month. If you’ve ever donated blood (or received blood from a donation) then you might have wondered why some types of blood can’t be given to some people. And what is it that makes blood types different anyway? This graphic looks at the compatibilities of different blood types, and below we’ll try to get to the bottom of what makes them different.

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The Chemistry of Blood Colours

The Chemistry of The Colours of Blood

Infographic on the chemistry of the colours of blood. Human blood is red due to haemoglobin, which is also red when deoxygenated - not blue! Spiders, crustaceans, and molluscs including octopuses and squid have blue blood due to haemocyanin, which contains copper instead of iron. When deoxygenated, haemocyanin is colourless. Some segmented worms, some leeches and some marines worms have green blood due to chlorocruorin, which is light green when deoxygenated. Marine worms including peanut worms, penis worms and brachiopods have purple blood due to haemerythrin, which is colourless when deoxygenated.
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Halloween’s almost here, which, for a large number of costumes, will require a liberal dousing of fake blood to complete the look. You probably already have a pretty good idea of the reasons behind the red colouration of human blood that fake blood mimics. However, red is not the only blood colour available – it also comes in blue, green, violet, and even colourless varieties – and this is a result of the specific chemicals that make up blood in different organisms.

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