This blood circulation diagram depicts the cardiovascular system, which transports nutrients and oxygen to all cells in the body. It is made up of the heart and the blood vessels that run throughout the body. The arteries carry blood away from the heart, while the veins return it. The blood vessel system resembles a tree: The "trunk," or main artery (aorta), divides into large arteries that branch into smaller and smaller vessels. The capillary network is a network of tiny vessels that…
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