Question

how does a sphygmomanometer work ?

Answer 1

sphygmomanometer is a device measures blood pressure. It is composes of an inflatable rubber cuff, which is wrapped around the arm. A measuring device indicates the cuff's pressure. A bulb inflates the cuff and a valve releases pressure.

Answer 2

the sphygmomanometer is used to measure the blood pressure with which blood flows through the venis in the the body.