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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.
Blood Pressure Terminology. Blood pressure is reported as a set of two numbers: systolic pressure and diastolic pressure, expressed as âmm Hg, or millimeters of mercury. When the blood pressure is said to be 120 over 80, or 120/80 mm Hg, the first number is the systolic pressure and the second the diastolic.Systolic pressure reflects the force exerted when a person's heart contracts and blood is ejected into the arteries.lood Pressure Terminology. Blood pressure is reported as a set of two numbers: systolic pressure and diastolic pressure, expressed as âmm Hg, or millimeters of mercury. When the blood pressure is said to be 120 over 80, or 120/80 mm Hg, the first number is the systolic pressure and the second the diastolic.