what are s1 s2 s3 and s4 heart sounds
Heart sounds In healthy adults, there are two normal heart sounds often described as a lub and a dub (or dup), that occur in sequence with each heartbeat. These are the first heart sound (S1) and second heart sound (S2), produced by the closing of the atrioventricular valves and semilunar valves, respectively. In addition to these normal sounds, a variety of other sounds may be present including heart murmurs, adventitious sounds, and gallop rhythms S3 and S4.
Samsung Galaxy S III The Samsung Galaxy SÂ III (or Galaxy S3) is a multi-touch, slate-format smartphone designed, developed, and marketed by Samsung Electronics that runs the Android OS by Google. Launched in 2012, it had sold about 70 million units by 2015.[5]