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Why are veins blue?

  1. Mar 22, 2015 #1
    The blood that oozes out when a vein is cut is red....then y do veins appear bluish to our eyes? Some say its because its deoxygenated....but if so then d blood oozing out should have also been blue..but it isn't...so what's d reason?
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  3. Mar 22, 2015 #2

    Doug Huffman

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  4. Mar 24, 2015 #3

    Suraj M

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    I didn't see you mention, 'Human' anywhere, so ... i could say.. the blood is blue, in case of octopus, shrimps,etc. :)
  5. Mar 24, 2015 #4
  6. Apr 3, 2015 #5


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    Staff: Mentor

    Except in very cases when it's green.

    It is also believed William Thomson, 1st Baron Kelvin suffered from sulfhemoglobinemia.

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