Question

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?

Answer 1

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.