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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.
A Univ. of Nev. Blood pressure is taken with a blood pressure cuff, or sphygmomanometer. Blood pressure is recorded as systolic pressure over diastolic pressure. Systolic pressure is created during the contraction of the heart, while diastolic pressure is created during relaxation. For example, 120/80.