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The heart pumps around the body to supply it with oxygen and nutrients as well as to remove waste products such as carbon dioxide and urea.

The heart pumps the blood around the body under pressure- this is measured at 2 points. The pressure when the heart is contracting- the systolic pressure and the pressure when it is resting- the diastolic pressure. Too high blood pressure can cause health problems such as a stroke (cerebral haemorrhage) or heart attack (cardiac arrest).

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