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the stethoscope is a device commonly used by doctors to monitor heart function. when listening to a heart beating using a stethoscope, the doctor hears the characteristic "lub-dub" sounds. the lub sound represents the of the atrioventricular valves and the dub sound represents the closure of the valves between .
doctors can also use stethoscopes to monitor respiratory function. a wheezing or whistling sound most likely indicates .
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