DOI:10.1109/ISETC.2012. S1 is normally a single sound because mitral and tricuspid valve closure occurs almost simultaneously. ![]() The normal heart sound demonstrating S1 followed by an S2, best audible at the apex. ![]() 10th International Symposium on Electronics and Telecommunications \(\ISETC\), Timisoara, Romania, pp. Some of the common mechanisms by which heart sounds are generated include (1) opening or closure of the heart valves, (2) flow of blood through the valve orifice, (3) flow of blood into the ventricular chambers, and (4) rubbing of cardiac surfaces. Typical heart sounds S1 and S2, of short duration (20200 ms) and low frequencies (20200 Hz), can be considered fractal in nature 2, 11. Permission from IEEE must be obtained for all other uses, including reprinting/ republishing this material for advertising or promotional \purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works. S2 heart sounds are heard when which of the following occurs A) when the atria contracts vigorously B) as the ventricular walls contract C) when the semilunar valves close D) as the mitral valve snaps open. When the two ventricles contract and pump out blood into the aorta and pulmonary. The heart tone dub, or S2 ( a combination of A2 and P2), is caused by the closure of the aortic valve and pulmonary valve at the end of ventricular systole. Personal use of this material is permitted. A nurse is auscultating a clients apical pulse to listen to the S1 and S2 heart sounds. S1 and S2 are high-pitched and S3 and S4 are low-pitched sounds. The heart tone lub, or S1, is caused by the closure of the mitral and tricuspid atrioventricular (AV) valves at the beginning of ventricular systole.
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