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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.
How Blood Pressure can Cause Headaches. Blood pressure is one of the three primary vital signs taken every time you visit your doctor. The blood pressure test measures how much pressure is put on your arterial walls when the heart beats (systolic pressure) and when it is at rest (diastolic pressure).