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The systolic pressure and the diastolic pressure, both of which are measured in millimeters of mercury (mmHg), are the two values that are generally used to express blood pressure. The systolic pressure is the maximum force that is exerted on the arterial walls during the contraction of the heart (systole), whereas the diastolic pressure is the smallest force that is exerted on the arterial walls when the heart is at rest between beats (diastole) . Buy here: