Question
The first sound of the heart beat occurs during 1______, associated with the closure of 2_______, and 3______, The second sound of the heart beat occurs during 4_____, associated with the closure of 5______, and 6______.
Answer: Option A
:
A
The most fundamental heart sounds are the first and second sounds, usually abbreviated as S1 and S2. S1 is caused by closure of the mitral and tricuspid valves at the beginning of isovolumetric ventricular contraction S1 is normally slightly split (~0.04 sec) because mitral valve closure precedes tricuspid valve closure; however, this very short time interval cannot normally be heard with the stethoscope and hence only a single sound is perceived. S2 is caused by closure of the aortic and pulmonic valves at the beginning of isovolumetric ventricular relaxation
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:
A
The most fundamental heart sounds are the first and second sounds, usually abbreviated as S1 and S2. S1 is caused by closure of the mitral and tricuspid valves at the beginning of isovolumetric ventricular contraction S1 is normally slightly split (~0.04 sec) because mitral valve closure precedes tricuspid valve closure; however, this very short time interval cannot normally be heard with the stethoscope and hence only a single sound is perceived. S2 is caused by closure of the aortic and pulmonic valves at the beginning of isovolumetric ventricular relaxation
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