Blood pressure is the proportion of how much weight the blood puts on the supply routes estimated in millimeters of mercury. Like water putting weight on a hose. It is estimated at two unique occasions. To begin with, when the heart pulsates it puts more weight on the corridors. This is the "top" number of the pulse. The specialized name is the systolic pressure. At the point when the heart unwinds between pulsates there is less weight however there is still some weight. This is the "base" number or diasystolic pressure. So in the precedent pulse of 120/80 there is 120 millimeters of weight amid the heartbeat and 80 millimeters of weight between pulsates.

Millimeters of mercury (mmHg) is a proportion of weight. 1 mmHg is the measure of weight it takes to raise a section of mercury 1 mm. In this way, 120 mmHg is the measure of weight it takes to raise a segment of mercury 120 mm.