blood pressure is the pressure per unit area,which the following blood exerts on the walls of blood vessels.In human beings,the blood pressure is measured at the artery of upper arm.The measurement of blood pressure indicates the higher or systolic blood pressure and lower or diastolic pressure.In normal young adults the systolic blood pressure is 120mm Hg and the diastole pressure is 80 mm Hg.Thus the normal blood pressure is expressed as 120/80 mm Hg.
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