(8)
A stethoscope is diagnostic instrument
is a diagnostic
commonly used doctors to listen to the (a)
sounds made inside human body. The
(b)
device two ear buds that are connected
(C)
by flexible cord to a sensitive sound
(d)
detector at other end. French physician
(e)
Dr. Rene first used cylindrical roll
(f)
of paper listen to the chest sounds
instead using his ear in early 19th century. (h)
Answers
The stethoscope is an acoustic medical device for auscultation, or listening to internal sounds of an animal or human body. It typically has a small disc-shaped resonator that is placed against the skin, and one or two tubes connected to two earpieces. A stethoscope can be used to listen to the sounds made by the heart, lungs or intestines, as well as blood flow in arteries and veins. In combination with a manual sphygmomanometer, it is commonly used when measuring blood pressure.
Less commonly, "mechanic's stethoscopes", equipped with rod shaped chestpieces, are used to listen to internal sounds made by machines (for example, sounds and vibrations emitted by worn ball bearings), such as diagnosing a malfunctioning automobile engine by listening to the sounds of its internal parts. Stethoscopes can also be used to check scientific vacuum chambers for leaks and for various other small-scale acoustic monitoring tasks.
A stethoscope that intensifies auscultatory sounds is called a phonendoscope.