What can a stethoscope find out about ur heart & lungs help...

A lot : Needs years education and training to use properly to distinguish different heart sounds and detect check breathing.

Much: The stethoscope can hear the heart's rate, rhythm, and any abnormalities like rubs, clicks, extra beatsetc for the lung, it can hear clear breath sounds, diminished breath sounds, crackles, wheezing, rales, etc. The stethoscope is not perfect but its a great tool way to start an examination.

Lots: At one time, before there were echos, mris, catheters, etc. This was the only way to know what was happening in the chest, and i admire my mentors who were much better at this than i. Still, it helps to choose the best tests by hearing heart rate, murmurs, extra heart sounds, relative strength and timing of opening and closing of heart valves, fluid or infection in the lungs, airway obstruction.