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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. This "dub" sound is typically heard as a sharp snap because the semilunar valves tend to close much more rapidly than the AV valves. Because diastole occupies more time than systole, a brief pause occurs [after the] second heart sound when the heart is beating at a normal rate. Therefore, the pattern that one hears is one of: "lub-dub" pause, "lub-dub" pause, and so on.

Sometimes, especially in young normal individuals, a third heart sound can be heard. This sound is produced by the very rapid influx of blood into the partially filled ventricle. It is typically very faint and as such [difficult] to hear"

[Reference]: http://www.jdaross.cwc.net/normal_heart_sounds.htm

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