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We are blood vessels that send blood back towards your heart. most of the blood we carry doesn't have much oxygen left in it. what is this?

We are blood vessels that send blood back towards your heart. most of the blood we carry doesn't have much oxygen left in it. what is this?
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2 votes
We are blood vessels that send blood back towards your heart. most of the blood we carry doesn't have much oxygen left in it. what is this?

User Sjoerd
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1 Answer

3 votes
veins carry blood to the heart while arteries carry blood away from the heart distributing it throughout the body.
User Tofarr
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