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Blood never turns blue. It's been argued that it turns blue without oxygen, but this is merely a myth. The blue color you see is the color of the tissue that makes up your veins. Blood will however, take on a darker shade of red without oxygen, but it never goes anywhere near the color blue. If you would like to see for yourself, the next time you get a blood draw, or you donate blood, look at the blood in the tube. The tube is a vacuum (so no oxygen) and the blood does not look blue.

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11y ago
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14y ago

Blood is only blue when carrying Carbone Dioxide back to the heart to be exhaled through the mouth. When your blood appears red it means it is carrying oxygen. For this reason you never bleed blue blood.

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12y ago

Blood is never blue, blood is always red but just different shades. oxygen is not what make blood red anyways it is the hemoglobin the is in the blood ( hemoglobin contains iron (iron is the same thing that make mars red)

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12y ago

Blood is normally blue when it does not have oxygen. Therefor in your veins it is blue because it has already given all of the oxygen in it to parts of your body, and if you cut yourself the blood is exposed to air and turns red.

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11y ago

Blood makes blood red, whereas blood is blue when there is no air in it.

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13y ago

Blood is only blue in Horseshoe Crabs.

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12y ago

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Q: What causes blood to be blue?
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Related questions

Why do red blood cells turn blue?

Lack of oxygen causes blood cells to appear blue. Remember that all veins except the pulmonary vein carry 'oxygen depleted blood' or deoxygenated blood. Dont worry that your veins appear blue though! Its fine.


Do Spiders have transparent blood.?

Spiders have blue blood. In human blood oxygen is bound to hemoglobin which contains iron, giving it the blood a red color. In spiders, as well as other Arthropods and Molluscs, oxygen is bound to hemocyanin which contains copper, giving its blood a blue color. The same interaction that causes oxygenated blood to color, also causes iron rust to appear reddish and the oxidized copper to appear green. However, I have noticed no color in spider blood before.


Who is blue baby?

Blue baby is an infant born with cyanosis as a result of a congenital cardiac or pulmonary defect that causes inadequate oxygenation of the blood.


What element makes spider's blood blue?

That's just nature. If it were'NT nature i'd have like pink-blue blood and you would have like black blood....


What is the causes of blue revolution?

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Spiders have transparent blood?

Spiders have blue blood. In human blood oxygen is bound to hemoglobin which contains iron, giving it the blood a red color. In spiders, as well as other Arthropods and Molluscs, oxygen is bound to hemocyanin which contains copper, giving its blood a blue color. The same interaction that causes oxygenated blood to color, also causes iron rust to appear reddish and the oxidized copper to appear green. However, I have noticed no color in spider blood before.


What causes new babies to look blue when all their blood vessels look the same as their veins through their skin?

I think its blue baby syndrome, a side effect is skin going blue.


But do penguins have blue blood?

No, penguins do not have blue blood. An animal who does have blue blood is the lobster and lizards have green blood.


What causes nail to turn blue or black?

Your nail turns blue when the blood clot in it.


What do blue lobsters eat?

The copper in their blood gives their blood a bluish tint. It is much like how iron in our blood causes our blood to be red. Haemoglobin is a red pigment in blood that makes the blood red when it comes out into oxygen (that why when we bleed, our blood is red.) some animals do not have haemoglobin in blood, for example LOBSTERS! So this is why their blood is blue.


What does the idiom blue blood literally mean?

"Blue blood" LITERALLY means blood that is blue in color.


What makes the blood blue?

Mammalian blood is NOT blue.