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How the structure of the heart allows it to function Every cell in the body requires a supply of oxygen and food, luckily, that's exactly what the blood does, providing a transport medium to deliver critical supplies and also to remove harmful waste products to the cells. However, without a pump, blood is next to useless if it cannot get to the cells in the first place. The role of the heart is to pump blood around the body. It has to do this about 70 times a minute, 60 minutes an hour, 25 hours per day, from the day your were born to the day you die. Therefore, the heart has to be efficient at pumping about 4300 gallons of blood each day, and respond according to the body's metabolic rate. For example, when you exercise, your heart rate increases to meet the demand for more oxygen that is required...

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