Question #121572. Asked by alekhya23.
Last updated May 14 2021.
Originally posted May 25 2011 11:06 PM.
Answer has 17 votes
Currently Best Answer
gtho4 Moderator 23 year member
Answer has 17 votes.
Currently voted the best answer.
It's blue, as per this explanation:
The spiders blood is different from the men's blood. In humans the oxygen is bound to hemoglobin, a molecule that contains iron and beeing red gives that colour to the blood. In spiders, and in many other arthropods (as crustaceans) and also in most mollusks the oxigen is bound to a different molecule called hemocyanin that contains copper instead of iron. The hemocyanins are proteins colourless in the reduced or deoxygenated state but the oxydized copper beeing blue/green, gives that colour to the oxygenated blood. Therefore...spiders have "blue" blood... (Dr. Mabel Rodrigues)