Your heart beat of course.
Apex
The valves opening and closing
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
Korotkoff sounds are the sounds heard through a stethoscope during the measurement of blood pressure. They are created by the turbulent flow of blood through the constricted artery when the cuff is gradually deflated. These sounds are used to determine systolic and diastolic blood pressure readings.
Heart sounds are heard through a stethoscope during the cardiac cycle, primarily due to the closing of heart valves. The two main sounds, "lub" (S1) and "dub" (S2), correspond to the closure of the atrioventricular valves and the semilunar valves, respectively. These sounds can be detected at various points on the chest, with distinct characteristics depending on the heart's activity and any underlying conditions. Proper auscultation techniques are essential for accurate evaluation.
The sound is caused by the closing of valves in the heart.