When measuring blood pressure, two values are always measured: the systolic (upper value) and the diastolic blood pressure (lower value). 140/80 (140 to 80) means that the systolic blood pressure is 140, the diastolic is 80.
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The systolic pressure is the pressure that arises when the heart is contracting and the blood is pumping into the arteries. The pressure in the slackening phase, when the heart practically takes air to the Next pump, is then the diastolic blood pressure.