Most likely your breathing, although he might also be listening for your heartbeat.
This is so he can detect any problems with the timing of either, and also listen for signs of e.g. fluid in the lungs.
Stethoscope
heart and lungs
A stethoscope is used to listen to the internal sounds of a human or animal. It can not only be used to listen to the lung and heart, but also the intestines and blood flow in the arteries and veins.
When the doctor listens to the lungs through a stethoscope (ausculation), diminished or bronchial breath sounds may be heard. By tapping on the chest (percussion) while listening through the stethoscope, the doctor can often tell if the lung is collapsed
"The doctor used the stethoscope on the patient to try and hear his heartbeat and breathing patterns."
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A doctor can tell if a person has abnormal breath sounds by listening with a stethoscope. This is often seen in people with COPD or asthma.
A stethoscope does not produce or use energy, it is a medical device used for listening to sounds within the body.
The doctor used his stethoscope to listen to the sound of your heatbeat
* Pulse rate * Listening to heart sounds through a stethoscope * Blood pressure at rest * Blood pressure after moderate to strenuous exercise
Yes you can but there are better listening devices.
Depends : fingers, stethoscope, EKG.