Question

In terms of being open or closed, what is the state of the mitral and tricuspid valve (left and right atrioventricular valves, respectively) at the end of the first heart sound?

Answer 1

Answer:

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Answer 2

Explanation:

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Heart sounds are discrete bursts of auditory vibrations of varying intensity (loudness), frequency (pitch), quality, and duration. The first heart sound (S1) is composed of several high-frequency components; only the first two are normally audible. These two sets of audible vibrations are temporally related to closure of the mitral and tricuspid valves. The first heart sound coincides with contraction of the ventricles, thus identifying the onset of ventricular systole and the end of mechanical diastole.

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