Which of these normal heart sounds can BEST be heard on the left, fifth intercostal space close to the clavicle and occurs as the mitral and tricuspid valves close simultaneously?
a. S1 c. S3
b. S2 d. S4
A
There are two normal heart sounds heard on auscultation: S1 and S2 . S1 is the sound of the mitral and tricuspid valves closing simultaneously ("lubb"), and S2 is the sound of the pulmonic and aortic valves closing simultaneously ("dubb").
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