Circulatory and Immune Systems Question
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What is the best description of veins?
- They are small intestines.
- They are blood vessels that send blood away from the lungs to all different parts of the body.
- They are blood vessels that send blood back towards the heart. Most of the blood they carry does not have much oxygen left in it.
- They take oxygen that the body needs from the air and put it in the bloodstream. They also take carbon dioxide that is in the blood and send it out of the body.