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Your blood flows through your entire body in small tunnels, called blood vessels.
Your blood makes two trips
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1. Heart 2. Aorta
3. Arteries 4. Veins
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Your blood makes two trips, one short and one long. During the short trip, your blood is pumped to the lungs. There, it gets rid of any carbon dioxide and fills up on oxygen.
During its longer trip, your blood travels through your body, to the tiniest little cell, before it returns to your heart.
During this long trip, your blood passes through your heart and leaves nourishment so that your heart has the strength to beat.
When your blood passes through the kidneys, it is cleansed of some waste and in the small intestine it absorbs nourishment. Your blood then carries this nourishment out to other parts of your body.
Blood vessels
Your blood vessels divide up into smaller and smaller tunnels, so that your blood can reach every little part of your body. The smallest blood vessels, as thin as hairs, are called capillaries. This is where your blood hands over its oxygen and the nourishment it is carrying, so that every cell gets what it needs. On their side of the deal, the cells hand over any carbon dioxide and other waste that the blood carries with it on its continued journey. The blood continues from the capillaries and on into the small, narrow blood vessels called veins. Now your blood is on its way back to the heart. Finally, your blood has returned to your heart, which then once again pumps your blood to your lungs for a new trip.
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