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Your heart beat of course.
The valves opening and closing
Apex
The sounds of the Heart, lungs, circulatory and gastrointestinal systems are heard using the amplified stethoscope. It makes it easier for a medical professional to hear the sounds that are produced by these systems in the body.
These sounds are called bruit and are listened to using a stethoscope. Bruit indicates partial arterial obstruction.
Barlow Syndrome
when a doctor listens to the chest with a stethoscope during the Valsalva maneuver, characteristic heart sounds are heard. Variations in these sounds can indicate the type of abnormality present in the heart.
umblicus
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 sound is caused by the closing of valves in the heart.
Pneumonia is the typical condition that causes rales. Rales sound a little like Rice Krispies when heard through the stethoscope.
Mummur's are pathologic heart sounds that are produced as a result of turbulent blood flow that is sufficient to produce audible noise. Most murmurs can only be heard with the assistance of a stethoscope.