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Blood vessels are present in closed circulatory system. They carry blood from heart to different body parts then back to heart. Also they carry out specific functions such as absorption of food constituents in stomach and exchange of gases in lungs.
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The function of blood vessels is that they carry blood from the hear to other parts of the body and blood back to the heart. They transport nutrients and oxygen to all parts of the body. Hope this helps an if it does please mark it as the best. I just need 1 more best answer to get to my next rank...
**heart** mistake in answer. :)
Sorry my tab wasn't working properly 
I meant heart there