Okay so now we got the blood pressure cuff
inflated fully. And there’s no longer a pulse coming through that brachael artery. Now you
want to slowly open up the dial, so that the blood pressure is, the millimeters of mercury
is falling around 2 millimeters of mercury per second. And when you hear that first beat,
that is your systolic pressure, and then continue deflating at 2 millimeters of mercury until
you no longer hear that beat, and that is your diastolic pressure. So the systolic pressure
is the pressure on top, and the diastolic pressure is the pressure on bottom. And we
can see that pressure on top, that systolic pressure, is the pressure that is highest.
So in the arterial system when the heart contracts, that’s that high number. And in the arterial
system when the heart relaxes, that’s that lower number.