Final answer:
A sphygmomanometer is used to measure blood pressure, which includes an inflatable cuff, a manometer, and detects blood flow changes to determine systolic and diastolic pressures.
Step-by-step explanation:
Blood pressure is measured with the aid of an apparatus known as a sphygmomanometer. This medical device consists of an inflatable cuff to restrict blood flow, a manometer to measure the pressure, and a process for detecting when blood flow starts and is obstructed. The cuff is placed around the upper arm and inflated to block blood flow, then pressure is slowly released to measure systolic and diastolic pressures, with readings presented in millimeters of mercury (mm Hg).