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The low point is referred to as diastole and occurs when the ventricles relax and minimal pressure is exerted against the vessel wall. A normal blood pressure for a healthy adult ranges from 90 to 120 mm Hg systolic and from 60 to 80 mm Hg diastolic. Under normal circumstances, blood volume remains constant at 5,000 mL.
This force creates pressure on the arteries. This is called systolic blood pressure. A normal systolic blood pressure is below 120. A systolic blood pressure of 120 to 139 means you have prehypertension, or borderline high blood pressure.Even people with prehypertension are at a higher risk of developing heart disease. A systolic blood pressure number of 140 or higher is considered to be hypertension, or high blood pressure.hen this noise goes away, that indicates the diastolic blood pressure. The systolic blood pressure number is always said first, and then the diastolic blood pressure number is given. For example, your blood pressure may be read as 120 over 80 or written as 120/80.