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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, or hypertension, occurs when your blood pressure is 140/90 most of the time, according to PubMed Health. Blood pressure measures the force against the artery walls as your blood is circulated through your body. Many things can affect the numbers, including heredity, illness, nutrition and hormones.