Yk those blood pressure measuring things doctors use? Ones that press your arm really hard and stuff? How do they work?
In: Technology
The blood pressure is higher when your heart is contracted (systolic pressure) and lower when your heart is resting (diastolic pressure). You apply pressure from the outside on your artery. Now:
* If the pressure is higher than systolic pressure, the artery would be squeezed shut.
* If the pressure is lower than diastolic pressure, the artery would be open.
* If the pressure is between these two the artery would alternately open and shut.
The way you measure blood pressure is that you listen for the sound of the pulse at the artery while slowly lowering the pressure in the sleeve. Once you start hearing the pulse, you mark the systolic pressure. Once you stop hearing it, you mark the diastolic pressure. This can be done by a human with a stethoscope or with a device that automates the whole process.
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