How do stethoscopes work?

Have you ever been to the doctor and had them listen to your body with a stethoscope? It’s that funny looking thing that looks like a long rubbery tube with a round metal circle on one end and two ear pieces on the other. Doctors always seem to have one handy, but what is it and how does it work? We asked pediatrician Emma Gerstenzang to help us find the answer. Got a question that you need scoped out? Send it to us at BrainsOn.org/contact, and we’ll prescribe you an answer! See omnystudio.com/listener for privacy information.