Which of these normally heard sounds is the simultaneous closing of the pulmonary and aortic valves and is heard on the right, second intercostal space?
a. S1 c. S3
b. S2 d. S4
B
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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