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Which gas would be most abundant in a vein that takes blood?; What gas do veins carry back to the heart?; What is the main vein that takes blood away from the heart?; Which vessels carry co2 rich blood
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Which gas would be most abundant in a vein that takes blood?; What gas do veins carry back to the heart?; What is the main vein that takes blood away from the heart?; Which vessels carry co2 rich blood back to the heart?

User Spektre
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Answer: The veins (blue) take oxygen-poor blood back to the heart. Arteries begin with the aorta, the large artery leaving the heart. They carry oxygen-rich blood away from the heart to all of the body's tissues.

User Slicekick
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