The downward slope - The cardiac cycle - Heart sounds

5 important questions on The downward slope - The cardiac cycle - Heart sounds

Which valves produce S1?

The mitral and tricuspid valve- the mitral valve preceeds.

What does S1 sound like?

Low pitched and lasts longer

What does S3 sound like?

Very low pitched- not heard by naked ear usually
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Why does S3 only occur during the middle third of diastole?

Before this stage of ventricular filling there is not enough blood to create even the smallest amount of elastic tension that is needed for reverberation.

Can S4 be heard using a stethoscope?

No

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