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How long is the interval between the second sound of one heartbeat and the first sound...

How long is the interval between the second sound of one heartbeat and the first sound of the subsequent heart beat, in seconds? How does this interval compare to the interval between the first ad second sounds of a single heartbeat?

Science   Anatomy-And-Physiology   
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Answer #1

The first heart sound is caused by the closure of the atrioventricular valves and the second heart sound is caused by the closure of the semilunar valves.So the first heart sound is heart just at the beginning of ventricular systole and the second heart sound is heard at the end of ventricular systole.

So the time difference between the first and second heart sounds is equal to the duration of the systole.

On an average ; the duration of a heart beat is 0.8 seconds.The duration of systole is 0.3 second and that of diastole is 0.5 second.

So time difference between first and second heart sound is 0.3 second.

The time difference between the second heart sound and the first sound of next beat is equal to the period of diastole i.e. 0.5 seconds.

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