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Your blood vessels carry water and food out to all the cells or parts of your body. Blood vessels are flexible and stretch. When your heart beats the blood is pushed into your arteries is carries the good stuff around to the places in your body that needs it, then the left over slowly fills the veins that carries it back, taking the wastes and stuff to be cleaned by the kidneys and liver and to get more good stuuf like oxygen from your lungs or food that has been absorbed through your stomach. Also the high part of your blood pressure reading is when the blood whooshes through your vein as the heart beats and the low part is when the heart is relaxed and the doctor can tell if your veins and heart are doing a good job by watching these numbers over time.

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