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What structures of the circulatory system carry blood containing carbon dioxide from the body back to the heart ?
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What structures of the circulatory system carry blood containing carbon dioxide from the body back to the heart ?

User Mykola Kharechko
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2 Answers

2 votes
The lungs. The left and right ventricle I believe.
User Zon
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4 votes
the answer is air sacs

your welcome :))

User Killogre
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