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A stethoscope is a medical device used to listen to internal sounds of a human or animal body. It is used to measure a person's heartbeat and breathing. A stethoscope is made up of a small disc-shaped resonator that is placed against the skin, with either one or two tubes connected to two earpieces. The modern stethoscope is made up of a Y-shaped flexible plastic tube.The word stethoscope comes from the Greek words stethos, meaning "chest or breast", and -scope, meaning "an instrument for seeing".A quality stethoscope is durable, comfortable to use, and provides good acoustics for accurate assessment of heart, lung, and gastrointestinal sounds.