Question

Blood pressure is measured with an instrument, called as
A) Thermometer
B) Stethoscope
C) Sphygmomanometer
D) Clinical thermometer

Answer 1

Hint: The strain of the flowing blood against the walls of the blood vessels is blood pressure. It can be measured with an instrument that consists of an inflatable cuff, measuring unit, and a mechanism for inflation which may be either a manually operated bulb and valve or pump operated electrically.

Complete answer:
Option (A): The word thermometer comprises two words i.e., ‘thermo’, meaning heat, and ‘meter’, meaning measuring device. Thus, it is a device that measures the temperature but not the blood pressure.
Option (B): A stethoscope is a medical device that is used for listening to the internal sounds of the body. It has a tiny resonator in the form of a disc that is positioned against the skin and one or two tubes attached to two earpieces.
Option (C): Sphygmomanometer, also known as blood pressure monitor or blood pressure gauge, is an instrument that measures the blood pressure. It consists of an inflatable cuff, a measuring device i.e., a mercury manometer, and a mechanism for inflation.
Option (D): A clinical or medical thermometer is used for measuring the temperature of the animal or human body. The tip of the thermometer is inserted into the mouth under the tongue, under the armpit, into the ear, etc. to measure the temperature.

Hence, the correct option is (C).

Note: In the year 1881, Samuel Siegfried Karl Ritter von Basch invented the sphygmomanometer. It is used for measuring blood pressure. The ideal blood pressure is considered to be between $90/60$ mm Hg and $120/80$ mm Hg.