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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.
Your blood pressure is made up of two numbers: systolic and diastolic. When the heart beats, it contracts. The blood is forced through your arteries, which makes your blood pressure go up. This is the systolic blood pressure.