Understanding Blood Pressure Blood pressure is the force exerted by the blood against the walls of the arteries as it is pumped around the body by the heart. It is measured in millimeters of mercury (mmHg) and is usually expressed in two numbers, such as 120/80 mmHg. The top number, or systolic pressure, represents the pressure when the heart beats and pumps blood. The bottom number, or diastolic pressure, represents the pressure when the heart is at rest between beats. Both numbers are...
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