When copper instead of iron carries oxygen in the blood, it turns green. Iron gives hemoglobin its red color but oxidized copper is green in color.
Only vulcans have green blood. Mr. Spock, the Enterprise's science officer in the famous TV series, was said to have the green blood of his father, who belonged to the race of pointy-eared, logic-seeking Vulcans.
Green blood can be found in some forms of life such as some marine worms. But it is a condition normally associated with science fiction and not medical texts.
Also,wheat grass juice bears a close resemblance to the “hemoglobin” in our blood, the juice is often called as “green blood” and the therapy using it is called as “green blood therapy”. Wheat grass juice is a complete food
But,in Vancuber, Canada, surgeons have found green blood in a 42 years old man. He was undergoing an operation on his leg to relieve a circulation.
Dr Alana Flexman, of St Paul's Hospital, said: "During insertion, we normally see arterial blood come out. That's how we know we're in the right place. And normally that blood is bright red, as you would expect in an artery.”
"But in his case, the blood kept coming back as dark green instead of bright red. It was sort of a green-black. Like an avocado skin maybe.”
Further tests showed he had taken too many of a headache pills called Sumatriptan.
He was diagnosed a rare condition in which sulphur from the sumatriptan combined with the blood's hemoglobin to change its color (sulfhemoglobin).
The man has made a full recovery now.
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