arteries pumping blood to the brain pass close to the inner ear and so transmit sound
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There are certain veins leading from your heart. and stuff.
Place the stethoscope over the heart (left side of the chest) and count the heart beat for a full minute.
the sounds of the heart "LUBB-DUPP" are produced due to the sharp closure of the valves of the heart. the first sound is produced when the auricular-ventricular valve(bicuspid and tricuspid valve)closes. the second one is produced when the semilunar valves(pulmonary and aortic valves) close.
Sounds like your heart to me, but you may just be misaligned in the spine. I'd go see a doctor.
The heart is situated in the mediastinum, which is a space between the lungs in the approximate center of your chest behind your breastbone. The heart is actually located more to the left, though, and so the reason you'll feel it beat harder on the left side is because that's where it is. There are, however, congenital birth defects in which the heart is found on the right side of the chest. This is a rare case and the average human will have his/her heart situated more toward the left.