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The first heart sound or "lub" results from closure of the tricuspid and mitral valves. It is a rather low-pitched and a relatively long sound which, as indicated in, represents the beginning of ventricular systole. The second heart sound, or "dub," marks the beginning of ventricular diastole. It is produced by closure of the aortic and pulmonary (pulmonic) semilunar vanes when the intraventricular pressure begins to fall
Wiki User
∙ 15y ago
Wiki User
∙ 13y agoThey are the heart sounds S1 and S2. S1 or "lub" is the snapping shut of the tricuspid and mitral valves as the ventricles begin to contract. S2 or "dub" follows and is the closure of the aortic and pulmonary valves as the ventricular pressures drop below the aortic or pulmonary pressure.
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