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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.
These numbers refer to two types of blood pressure: 1  Systolic pressure (the number on top) measures the pressure inside your blood vessels at the moment your heart beats. 2  Diastolic pressure (the number on the bottom) measures the pressure in your blood vessels between heartbeats, when your heart is resting.