physics

what is the physics behind the process of administering the following
1. measurement of blood pressure using sphygmomanometer
2.giving injections
3.administering intravenous infusion
4.giving oxygen in the ward and operating theater
5. administering blood transfusion
6.sucking excess blood after delivery and operation
7.process of blood donation
8.process of administering anesthesia

asked by Williams

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