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Contraction of heart ventricles generates blood pressure. It is the hydrostatic pressure that blood exerts against he wall of a vessel. Rigid vessels maintain blood pressure; less rigid vessels deform and blood pressure is lost.
Diet and High Blood Pressure. High blood pressure or hypertension is defined as a blood pressure of above 140 mm Hg (systolic) and or 90mm Hg (diastolic). How to Measure Blood Pressure - Animation. Animation to understand what is blood pressure and how to measure systolic and diastolic readings of blood pressure.