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Originally Posted by dezzo
Well number 1 is generally to stop you from dying 
For 2 its main function is to distribute oxygenated blood from the heart around the body and to return de-oxygenated blood to the lungs.
Thats the *very* basic version of it. You should be able to find some more at:
http://en.wikipedia.org/wiki/Circulatory_system |
It also carries hormones through the system without these we would not grow or function in anyway,and removes waste products from the lymphatic system
also carries antibodies to fight disease