Answers

2014-06-14T13:41:30+08:00
It allows the blood to flow from the heart to every body cell and then back to the heart.
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2014-06-14T13:41:57+08:00
It carries or transports the blood through out our body.

arteries - carries the blood away from the heart
veins - carries blood towards the heart
capillaries - the gas exchange happens here. (deoxygenated and oxygenated blood)
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