The blood pressure is measured by two sets of Numbers. The first number (systolic pressure/upper pressure) shows the pressure in the blood tube when the heart is pumping out blood, while the second number, or the number written below (systolic pressure/lower pressure) shows the pressure in the blood tube when the heart is releasing blood between heart beats.<br> Blood pressure is the pressure on the walls of blood vessels as the heart contracts to pump blood into them. Pressure is usually measured in millimeters of mercury (mmHg). The systolic pressure is called systolic blood pressure, usually about 120 mmHg. The diastolic
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