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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 is made up of two numbers: 1  The âtopâ number is the systolic blood pressureâthe pressure while the heart is pumping blood out. 2  The âbottomâ number is the diastolic blood pressureâthe pressure while the heart is filling up with blood, getting ready to pump again.