When you go to the doctor, he or she will probably use something called a stethoscope to hear the sounds that the inside of your body makes. Usually, we can't hear these sounds very well, but with a stethoscope they get a whole lot louder! With it, the doctor can hear your heartbeat,the air going in and out of your lungs, tummy gurgles, and other wonderful noises that tell the doctor how things are working inside.
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