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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.
High blood pressure (hypertension) is defined as systolic blood pressure -- the top number -- averaging 140 mmHg or greater, and/or diastolic blood pressure -- the bottom number -- averaging 90 mmHg or greater. The systolic pressure is the pressure of blood in the vessels when the heart contracts.