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Blood flows through your body in a basic, defined pattern. It leaves your heart full of oxygen as well as moves with your arteries. From there, it moves right into veins and supplies your body organs and also tissues with oxygen before relocating right into your veins. Blood streams via your veins back to your heart, which pumps it to your lungs to pick up more oxygen. Then, it leaves your lungs and your heart to recirculate through your arteries again.