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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.
There are two components to blood pressure: 1  Systolic pressure: The pressure in the artery during the ventricular contraction phase of the heart cycle. The pressure in the vessel is highest at this time. 2  Diastolic pressure: The pressure in the artery when the ventricles are relaxed.