Cardiac Cycle, Dr. D. Penney

Table 1.03. The heart sounds (phonocardiogram)

Sound Normal ? cause Where heard

S1 yes closure of tricuspid/mitral valves apex of heart

S2 yes closure of pulm. & aortic valves above heart base; aortic on R, pulm. on L.

S3 no ventricular filling over heart?

S4 no atrial systole over heart?

Sound	Normal ?	cause	Where heard
S1	yes	closure of tricuspid/mitral valves	apex of heart
S2	yes	closure of pulm. & aortic valves	above heart base; aortic on R, pulm. on L.
S3	no	ventricular filling	over heart?
S4	no	atrial systole	over heart?

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