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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 is diagnosed with consistent numbers of the top above 140 and the bottom above 90. Sudden high blood pressure occurs when a spike in your high blood pressure happens suddenly and stays high. High blood pressure occurs when the force of the blood flowing through narrow arteries is greater than usual, making the heart work harder to circulate the blood through the bodyâs blood vessels.