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Why is it that sometimes my blood is black and other times it’s red?

Same vein, don’t hit me with some “there are different kinds of blood vessels”-bullshit, I know, not what I’m talking about.
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tobynshorty · 51-55, F
What he said 👆
YoMomma ·
Oxygen level? Idk i forget
faery · F
Darker blood indicates lower oxygen saturation
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