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RE: Misunderstood Body Functions
This misconception may have come from the green-blue appearance of veins
Another reason I thought could be cyanosis gives rise to bluish discoloration of the fingers, which might have lead to people wrongly assuming less oxygen means blue.
Yeah this could be true, you're right! Fun fact, central cyanosis can also lead to a dyscolouration of centrally supplied mucous membranes, such as under the eyes and tongue!
Yeah the tongue is a big differentiator between peripheral and central cyanosis xD