One thought on “Why Is Blood In a Vein Blue or Purple?

  1. Arti says:

    This increases pressure on the veins and causes them to expand. ” This is due to hormonal shifts that increase blood flow and increase sweating. Not only does pregnancy bring on hormone changes, but it also increases your blood volume by 20-40%. This is not uncommon. People with fair skin or light hair are more likely to have visible veins. People

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