HEART SOUND

The heart sound felt by a stethescope is caused due to the closure and opening of the valves. The generation of sound is rhythmic. The first sound is louder (lubb) and of longer duration (0.16-0.90sec). It is due to closure of the atrioventricular valves at the beginning of the ventricular systole. The second sound is of shorter duration (dubb) (0.10sec). It is caused at the end of the ventricular systole by the closure of semilunar valve. The heart beats at the rate of about 72-80 times per minute in adults. The ventricular systole causes a wave of distension due to blood flow. It is called as arterial pulse. It can be felt on the wrist. The pulse rate corresponds to rate of heartbeat.

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