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A stethoscope is a medical device that helps doctors and other medical professionals listen to internal body sounds. It typically has a small disk-shaped resonator that is placed against the chest, and two tubes connected to earpieces. The stethoscope works on the principle of multiple reflections of sound. A stethoscope can be used to:1.Listen to the sounds made by the heart, lungs, or intestines2.Listen to blood flow in arteries and veins3.Measure liver size4.Calculate blood pressure5.Determine lung sounds6.Detect heart sounds7.Measure bowel sounds8.Detect bruits9.Check congestive heart failure