Fig. 3.81 Heart sounds and how they relate to valve closure, the electrocardiogram (ECG), and ventricular pressure.
RPQST1st2nd1stSYSTOLESYSTOLEDIASTOLEVentricularpressureECGHeartsoundsAtrial contractionClosure of mitraland tricuspid valvesClosure of aortic andpulmonary valves"lub""lub""dub"